diff --git a/build/BuildSteps.cs b/build/BuildSteps.cs
index 2fbb92a65..a22f76efc 100644
--- a/build/BuildSteps.cs
+++ b/build/BuildSteps.cs
@@ -360,7 +360,9 @@ public static void CopyBinariesToSign()
 
             // These assemblies are currently signed, but with an invalid root cert.
             // Until that is resolved, we are explicity signing the AppService.Middleware packages
-            unSignedBinaries = unSignedBinaries.Concat(allFiles.Where(f => f.Contains("Microsoft.Azure.AppService.Middleware"))).ToList();
+            
+            unSignedBinaries = unSignedBinaries.Concat(allFiles
+                .Where(f => f.Contains("Microsoft.Azure.AppService.Middleware") || f.Contains("Microsoft.Azure.AppService.Proxy"))).ToList();
 
             // remove all entries for binaries that are actually unsigned (checked via sigcheck.exe)
             unSignedBinaries.ForEach(f => allFiles.RemoveAll(n => n.Equals(f, StringComparison.OrdinalIgnoreCase)));