diff --git a/src/System.Security.Cryptography.Primitives/src/System/Security/Cryptography/CryptoStream.cs b/src/System.Security.Cryptography.Primitives/src/System/Security/Cryptography/CryptoStream.cs
index c9f420d593a7..84b5844ae6fd 100644
--- a/src/System.Security.Cryptography.Primitives/src/System/Security/Cryptography/CryptoStream.cs
+++ b/src/System.Security.Cryptography.Primitives/src/System/Security/Cryptography/CryptoStream.cs
@@ -128,7 +128,7 @@ public void FlushFinalBlock()
                     innerCryptoStream.FlushFinalBlock();
                 }
             }
-            else
+            else if (_canWrite)
             {
                 _stream.Flush();
             }