diff --git a/integer.cpp b/integer.cpp
index 13a58a4e..cb38ca29 100644
--- a/integer.cpp
+++ b/integer.cpp
@@ -41,8 +41,10 @@
 
 #if CRYPTOPP_GCC_DIAGNOSTIC_AVAILABLE
 # pragma GCC diagnostic ignored "-Wunused"
+#if !defined(__clang__)
 # pragma GCC diagnostic ignored "-Wunused-but-set-variable"
 #endif
+#endif
 
 // Issue 340
 #if CRYPTOPP_GCC_DIAGNOSTIC_AVAILABLE