diff --git a/src/error.rs b/src/error.rs
index 861669bfa..3e372537c 100644
--- a/src/error.rs
+++ b/src/error.rs
@@ -766,7 +766,7 @@ mod tests {
                 e @ $error => {
                     assert!(format!("{}", e).len() >= 5);
                 } ,
-                e => panic!("{:?}", e)
+                e => unreachable!("{:?}", e)
             }
         }
     }
@@ -778,7 +778,7 @@ mod tests {
                     let desc = format!("{}", e.cause().unwrap());
                     assert_eq!(desc, $from.description().to_owned());
                 },
-                _ => panic!("{:?}", $from)
+                _ => unreachable!("{:?}", $from)
             }
         }
     }
diff --git a/src/httpmessage.rs b/src/httpmessage.rs
index 33b7d046f..79ebeab8c 100644
--- a/src/httpmessage.rs
+++ b/src/httpmessage.rs
@@ -581,27 +581,27 @@ mod tests {
         let req = TestRequest::with_header(header::CONTENT_LENGTH, "xxxx").finish();
         match req.body().poll().err().unwrap() {
             PayloadError::UnknownLength => (),
-            _ => panic!("error"),
+            _ => unreachable!("error"),
         }
 
         let req = TestRequest::with_header(header::CONTENT_LENGTH, "1000000").finish();
         match req.body().poll().err().unwrap() {
             PayloadError::Overflow => (),
-            _ => panic!("error"),
+            _ => unreachable!("error"),
         }
 
         let mut req = HttpRequest::default();
         req.payload_mut().unread_data(Bytes::from_static(b"test"));
         match req.body().poll().ok().unwrap() {
             Async::Ready(bytes) => assert_eq!(bytes, Bytes::from_static(b"test")),
-            _ => panic!("error"),
+            _ => unreachable!("error"),
         }
 
         let mut req = HttpRequest::default();
         req.payload_mut().unread_data(Bytes::from_static(b"11111111111111"));
         match req.body().limit(5).poll().err().unwrap() {
             PayloadError::Overflow => (),
-            _ => panic!("error"),
+            _ => unreachable!("error"),
         }
     }
 }
diff --git a/src/multipart.rs b/src/multipart.rs
index 45126a2a6..4ac7b2a15 100644
--- a/src/multipart.rs
+++ b/src/multipart.rs
@@ -632,7 +632,7 @@ mod tests {
         let headers = HeaderMap::new();
         match Multipart::boundary(&headers) {
             Err(MultipartError::NoContentType) => (),
-            _ => panic!("should not happen"),
+            _ => unreachable!("should not happen"),
         }
 
         let mut headers = HeaderMap::new();
@@ -641,7 +641,7 @@ mod tests {
 
         match Multipart::boundary(&headers) {
             Err(MultipartError::ParseContentType) => (),
-            _ => panic!("should not happen"),
+            _ => unreachable!("should not happen"),
         }
 
         let mut headers = HeaderMap::new();
@@ -650,7 +650,7 @@ mod tests {
             header::HeaderValue::from_static("multipart/mixed"));
         match Multipart::boundary(&headers) {
             Err(MultipartError::Boundary) => (),
-            _ => panic!("should not happen"),
+            _ => unreachable!("should not happen"),
         }
 
         let mut headers = HeaderMap::new();
diff --git a/src/server/h1.rs b/src/server/h1.rs
index 6d504e41c..71ca51ffa 100644
--- a/src/server/h1.rs
+++ b/src/server/h1.rs
@@ -932,8 +932,8 @@ mod tests {
     macro_rules! not_ready {
         ($e:expr) => (match $e {
             Ok(Async::NotReady) => (),
-            Err(err) => panic!("Unexpected error: {:?}", err),
-            _ => panic!("Should not be ready"),
+            Err(err) => unreachable!("Unexpected error: {:?}", err),
+            _ => unreachable!("Should not be ready"),
         })
     }
 
@@ -943,8 +943,8 @@ mod tests {
                 Vec::new(), KeepAlive::Os);
             match Reader::new().parse($e, &mut BytesMut::new(), &settings) {
                 Ok(Async::Ready(req)) => req,
-                Ok(_) => panic!("Eof during parsing http request"),
-                Err(err) => panic!("Error during parsing http request: {:?}", err),
+                Ok(_) => unreachable!("Eof during parsing http request"),
+                Err(err) => unreachable!("Error during parsing http request: {:?}", err),
             }
         })
     }
@@ -953,8 +953,8 @@ mod tests {
         ($e:expr) => (
             match $e {
                 Ok(Async::Ready(req)) => req,
-                Ok(_) => panic!("Eof during parsing http request"),
-                Err(err) => panic!("Error during parsing http request: {:?}", err),
+                Ok(_) => unreachable!("Eof during parsing http request"),
+                Err(err) => unreachable!("Error during parsing http request: {:?}", err),
             }
         )
     }
@@ -968,10 +968,10 @@ mod tests {
             match Reader::new().parse($e, &mut buf, &settings) {
                 Err(err) => match err {
                     ReaderError::Error(_) => (),
-                    _ => panic!("Parse error expected"),
+                    _ => unreachable!("Parse error expected"),
                 },
                 _ => {
-                    panic!("Error expected")
+                    unreachable!("Error expected")
                 }
             }}
         )
@@ -991,7 +991,7 @@ mod tests {
                 assert_eq!(*req.method(), Method::GET);
                 assert_eq!(req.path(), "/test");
             }
-            Ok(_) | Err(_) => panic!("Error during parsing http request"),
+            Ok(_) | Err(_) => unreachable!("Error during parsing http request"),
         }
     }
 
@@ -1005,7 +1005,7 @@ mod tests {
         let mut reader = Reader::new();
         match reader.parse(&mut buf, &mut readbuf, &settings) {
             Ok(Async::NotReady) => (),
-            _ => panic!("Error"),
+            _ => unreachable!("Error"),
         }
 
         buf.feed_data(".1\r\n\r\n");
@@ -1015,7 +1015,7 @@ mod tests {
                 assert_eq!(*req.method(), Method::PUT);
                 assert_eq!(req.path(), "/test");
             }
-            Ok(_) | Err(_) => panic!("Error during parsing http request"),
+            Ok(_) | Err(_) => unreachable!("Error during parsing http request"),
         }
     }
 
@@ -1033,7 +1033,7 @@ mod tests {
                 assert_eq!(*req.method(), Method::POST);
                 assert_eq!(req.path(), "/test2");
             }
-            Ok(_) | Err(_) => panic!("Error during parsing http request"),
+            Ok(_) | Err(_) => unreachable!("Error during parsing http request"),
         }
     }
 
@@ -1052,7 +1052,7 @@ mod tests {
                 assert_eq!(req.path(), "/test");
                 assert_eq!(req.payload_mut().readall().unwrap().as_ref(), b"body");
             }
-            Ok(_) | Err(_) => panic!("Error during parsing http request"),
+            Ok(_) | Err(_) => unreachable!("Error during parsing http request"),
         }
     }
 
@@ -1072,7 +1072,7 @@ mod tests {
                 assert_eq!(req.path(), "/test");
                 assert_eq!(req.payload_mut().readall().unwrap().as_ref(), b"body");
             }
-            Ok(_) | Err(_) => panic!("Error during parsing http request"),
+            Ok(_) | Err(_) => unreachable!("Error during parsing http request"),
         }
     }
 
@@ -1093,7 +1093,7 @@ mod tests {
                 assert_eq!(*req.method(), Method::GET);
                 assert_eq!(req.path(), "/test");
             }
-            Ok(_) | Err(_) => panic!("Error during parsing http request"),
+            Ok(_) | Err(_) => unreachable!("Error during parsing http request"),
         }
     }
 
@@ -1121,7 +1121,7 @@ mod tests {
                 assert_eq!(req.path(), "/test");
                 assert_eq!(req.headers().get("test").unwrap().as_bytes(), b"value");
             }
-            Ok(_) | Err(_) => panic!("Error during parsing http request"),
+            Ok(_) | Err(_) => unreachable!("Error during parsing http request"),
         }
     }
 
@@ -1143,7 +1143,7 @@ mod tests {
                 assert_eq!(val[0], "c1=cookie1");
                 assert_eq!(val[1], "c2=cookie2");
             }
-            Ok(_) | Err(_) => panic!("Error during parsing http request"),
+            Ok(_) | Err(_) => unreachable!("Error during parsing http request"),
         }
     }
 
@@ -1256,7 +1256,7 @@ mod tests {
         if let Ok(val) = req.chunked() {
             assert!(val);
         } else {
-            panic!("Error");
+            unreachable!("Error");
         }
 
         // type in chunked
@@ -1268,7 +1268,7 @@ mod tests {
         if let Ok(val) = req.chunked() {
             assert!(!val);
         } else {
-            panic!("Error");
+            unreachable!("Error");
         }
     }
 
@@ -1501,7 +1501,7 @@ mod tests {
         let mut reader = Reader::new();
         match reader.parse(&mut buf) {
             Ok(res) => (),
-            Err(err) => panic!("{:?}", err),
+            Err(err) => unreachable!("{:?}", err),
         }
     }*/
 }
diff --git a/src/ws/frame.rs b/src/ws/frame.rs
index 030ae17af..2afcd0358 100644
--- a/src/ws/frame.rs
+++ b/src/ws/frame.rs
@@ -364,7 +364,7 @@ mod tests {
     fn extract(frm: Poll<Option<Frame>, ProtocolError>) -> Frame {
         match frm {
             Ok(Async::Ready(Some(frame))) => frame,
-            _ => panic!("error"),
+            _ => unreachable!("error"),
         }
     }
 
@@ -468,7 +468,7 @@ mod tests {
 
         if let Err(ProtocolError::Overflow) = Frame::parse(&mut buf, false, 0) {
         } else {
-            panic!("error");
+            unreachable!("error");
         }
     }
 
diff --git a/src/ws/proto.rs b/src/ws/proto.rs
index e17f749a0..5f077a4b9 100644
--- a/src/ws/proto.rs
+++ b/src/ws/proto.rs
@@ -210,7 +210,7 @@ mod test {
         ($from:expr => $opcode:pat) => {
             match OpCode::from($from) {
                 e @ $opcode => (),
-                e => panic!("{:?}", e)
+                e => unreachable!("{:?}", e)
             }
         }
     }
@@ -220,7 +220,7 @@ mod test {
             let res: u8 = $from.into();
             match res {
                 e @ $opcode => (),
-                e => panic!("{:?}", e)
+                e => unreachable!("{:?}", e)
             }
         }
     }