diff --git a/actix-http/src/ws/frame.rs b/actix-http/src/ws/frame.rs
index c9fb0cde9..35b3f8e66 100644
--- a/actix-http/src/ws/frame.rs
+++ b/actix-http/src/ws/frame.rs
@@ -178,14 +178,14 @@ impl Parser {
         };
 
         if payload_len < 126 {
-            dst.reserve(p_len + 2 + if mask { 4 } else { 0 });
+            dst.reserve(p_len + 2);
             dst.put_slice(&[one, two | payload_len as u8]);
         } else if payload_len <= 65_535 {
-            dst.reserve(p_len + 4 + if mask { 4 } else { 0 });
+            dst.reserve(p_len + 4);
             dst.put_slice(&[one, two | 126]);
             dst.put_u16(payload_len as u16);
         } else {
-            dst.reserve(p_len + 10 + if mask { 4 } else { 0 });
+            dst.reserve(p_len + 10);
             dst.put_slice(&[one, two | 127]);
             dst.put_u64(payload_len as u64);
         };