diff --git a/src/libraries/Common/src/System/Net/CredentialCacheKey.cs b/src/libraries/Common/src/System/Net/CredentialCacheKey.cs
index b84ec32774c611..bde43d8b3489c0 100644
--- a/src/libraries/Common/src/System/Net/CredentialCacheKey.cs
+++ b/src/libraries/Common/src/System/Net/CredentialCacheKey.cs
@@ -6,6 +6,7 @@
 using System.Diagnostics;
 using System.Diagnostics.CodeAnalysis;
 using System.Globalization;
+using System.Runtime.CompilerServices;
 
 namespace System.Net
 {
@@ -55,6 +56,7 @@ internal bool Match(Uri uri, int prefixLen, string authenticationType)
         //
         // Returns:
         // True if <prefixUri> is a prefix of this URI
+        [MethodImpl(MethodImplOptions.NoInlining)]
         private bool IsPrefix(Uri uri, int prefixLen)
         {
             Debug.Assert(uri != null);