diff --git a/awc/CHANGES.md b/awc/CHANGES.md
index b5f64dd3..fd5d0190 100644
--- a/awc/CHANGES.md
+++ b/awc/CHANGES.md
@@ -1,5 +1,12 @@
 # Changes
 
+## [0.2.2] - TBD
+
+### Changed
+
+* Always append a colon after username in basic auth
+
+
 ## [0.2.1] - 2019-06-05
 
 ### Added
diff --git a/awc/src/builder.rs b/awc/src/builder.rs
index 2bc52a43..a58265c5 100644
--- a/awc/src/builder.rs
+++ b/awc/src/builder.rs
@@ -115,7 +115,7 @@ impl ClientBuilder {
     {
         let auth = match password {
             Some(password) => format!("{}:{}", username, password),
-            None => format!("{}", username),
+            None => format!("{}:", username),
         };
         self.header(
             header::AUTHORIZATION,
@@ -164,7 +164,7 @@ mod tests {
                 .unwrap()
                 .to_str()
                 .unwrap(),
-            "Basic dXNlcm5hbWU="
+            "Basic dXNlcm5hbWU6"
         );
     }
 
diff --git a/awc/src/request.rs b/awc/src/request.rs
index 5c09df81..36cd6fcf 100644
--- a/awc/src/request.rs
+++ b/awc/src/request.rs
@@ -280,7 +280,7 @@ impl ClientRequest {
     {
         let auth = match password {
             Some(password) => format!("{}:{}", username, password),
-            None => format!("{}", username),
+            None => format!("{}:", username),
         };
         self.header(
             header::AUTHORIZATION,
@@ -664,7 +664,7 @@ mod tests {
                 .unwrap()
                 .to_str()
                 .unwrap(),
-            "Basic dXNlcm5hbWU="
+            "Basic dXNlcm5hbWU6"
         );
     }
 
diff --git a/awc/src/ws.rs b/awc/src/ws.rs
index d3e06d3d..95bf6ef7 100644
--- a/awc/src/ws.rs
+++ b/awc/src/ws.rs
@@ -195,7 +195,7 @@ impl WebsocketsRequest {
     {
         let auth = match password {
             Some(password) => format!("{}:{}", username, password),
-            None => format!("{}", username),
+            None => format!("{}:", username),
         };
         self.header(AUTHORIZATION, format!("Basic {}", base64::encode(&auth)))
     }
@@ -443,7 +443,7 @@ mod tests {
                 .unwrap()
                 .to_str()
                 .unwrap(),
-            "Basic dXNlcm5hbWU="
+            "Basic dXNlcm5hbWU6"
         );
     }