diff --git a/src/Microsoft.AspNetCore.Sockets.Common/Internal/Formatters/MessageFormatUtils.cs b/src/Microsoft.AspNetCore.Sockets.Common/Internal/Formatters/MessageFormatUtils.cs
index a217680fe3..df070f8621 100644
--- a/src/Microsoft.AspNetCore.Sockets.Common/Internal/Formatters/MessageFormatUtils.cs
+++ b/src/Microsoft.AspNetCore.Sockets.Common/Internal/Formatters/MessageFormatUtils.cs
@@ -1,8 +1,8 @@
-// Copyright (c) .NET Foundation. All rights reserved.
+// Copyright (c) .NET Foundation. All rights reserved.
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using System;
-using System.Binary;
+using System.Binary.Base64;
 
 namespace Microsoft.AspNetCore.Sockets.Internal.Formatters
 {
diff --git a/src/Microsoft.AspNetCore.Sockets.Common/Internal/Formatters/ServerSentEventsMessageFormatter.cs b/src/Microsoft.AspNetCore.Sockets.Common/Internal/Formatters/ServerSentEventsMessageFormatter.cs
index 0312813735..f3c3e8f757 100644
--- a/src/Microsoft.AspNetCore.Sockets.Common/Internal/Formatters/ServerSentEventsMessageFormatter.cs
+++ b/src/Microsoft.AspNetCore.Sockets.Common/Internal/Formatters/ServerSentEventsMessageFormatter.cs
@@ -1,8 +1,9 @@
-// Copyright (c) .NET Foundation. All rights reserved.
+// Copyright (c) .NET Foundation. All rights reserved.
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using System;
 using System.Binary;
+using System.Binary.Base64;
 using System.Buffers;
 using System.Text;
 using System.Text.Formatting;
@@ -160,4 +161,4 @@ namespace Microsoft.AspNetCore.Sockets.Internal.Formatters
             }
         }
     }
-}
\ No newline at end of file
+}
diff --git a/src/Microsoft.AspNetCore.Sockets.Common/Internal/Formatters/TextMessageFormatter.cs b/src/Microsoft.AspNetCore.Sockets.Common/Internal/Formatters/TextMessageFormatter.cs
index a6287ff80f..a9c6da8b81 100644
--- a/src/Microsoft.AspNetCore.Sockets.Common/Internal/Formatters/TextMessageFormatter.cs
+++ b/src/Microsoft.AspNetCore.Sockets.Common/Internal/Formatters/TextMessageFormatter.cs
@@ -1,8 +1,9 @@
-// Copyright (c) .NET Foundation. All rights reserved.
+// Copyright (c) .NET Foundation. All rights reserved.
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using System;
 using System.Binary;
+using System.Binary.Base64;
 using System.Buffers;
 using System.Text;
 using System.Text.Formatting;