diff --git a/tokio-util/src/codec/framed.rs b/tokio-util/src/codec/framed.rs
index ec7aa172f0b..d36248bc9b7 100644
--- a/tokio-util/src/codec/framed.rs
+++ b/tokio-util/src/codec/framed.rs
@@ -41,10 +41,7 @@ pin_project! {
     }
 }
 
-impl<T, U> Framed<T, U>
-where
-    T: AsyncRead + AsyncWrite,
-{
+impl<T, U> Framed<T, U> {
     /// Provides a [`Stream`] and [`Sink`] interface for reading and writing to this
     /// I/O object, using [`Decoder`] and [`Encoder`] to read and write the raw data.
     ///
@@ -127,9 +124,7 @@ where
             },
         }
     }
-}
 
-impl<T, U> Framed<T, U> {
     /// Provides a [`Stream`] and [`Sink`] interface for reading and writing to this
     /// I/O object, using [`Decoder`] and [`Encoder`] to read and write the raw data.
     ///
diff --git a/tokio-util/src/codec/framed_read.rs b/tokio-util/src/codec/framed_read.rs
index 0f2e16dc342..66cf7ef411d 100644
--- a/tokio-util/src/codec/framed_read.rs
+++ b/tokio-util/src/codec/framed_read.rs
@@ -36,11 +36,7 @@ pin_project! {
 
 // ===== impl FramedRead =====
 
-impl<T, D> FramedRead<T, D>
-where
-    T: AsyncRead,
-    D: Decoder,
-{
+impl<T, D> FramedRead<T, D> {
     /// Creates a new `FramedRead` with the given `decoder`.
     pub fn new(inner: T, decoder: D) -> FramedRead<T, D> {
         FramedRead {
@@ -68,9 +64,7 @@ where
             },
         }
     }
-}
 
-impl<T, D> FramedRead<T, D> {
     /// Returns a reference to the underlying I/O stream wrapped by
     /// `FramedRead`.
     ///
diff --git a/tokio-util/src/codec/framed_write.rs b/tokio-util/src/codec/framed_write.rs
index efc369ebfad..db80f5b443f 100644
--- a/tokio-util/src/codec/framed_write.rs
+++ b/tokio-util/src/codec/framed_write.rs
@@ -35,10 +35,7 @@ pin_project! {
     }
 }
 
-impl<T, E> FramedWrite<T, E>
-where
-    T: AsyncWrite,
-{
+impl<T, E> FramedWrite<T, E> {
     /// Creates a new `FramedWrite` with the given `encoder`.
     pub fn new(inner: T, encoder: E) -> FramedWrite<T, E> {
         FramedWrite {
@@ -64,9 +61,7 @@ where
             },
         }
     }
-}
 
-impl<T, E> FramedWrite<T, E> {
     /// Returns a reference to the underlying I/O stream wrapped by
     /// `FramedWrite`.
     ///