diff --git a/test/hash_reference_values.cpp b/test/hash_reference_values.cpp
index d0f565f..2e95015 100644
--- a/test/hash_reference_values.cpp
+++ b/test/hash_reference_values.cpp
@@ -4,16 +4,17 @@
 
 #include <boost/config/pragma_message.hpp>
 
-#if defined(__clang__)
-# pragma clang diagnostic ignored "-Wlong-long"
-
-#elif defined(__GNUC__) && __cplusplus < 201100L
+#if defined(__GNUC__) && !defined(__clang__) && __cplusplus < 201100L
 
 BOOST_PRAGMA_MESSAGE("Skipping test under GCC in C++98 mode")
 int main() {}
 
 #else
 
+#if defined(__clang__)
+# pragma clang diagnostic ignored "-Wlong-long"
+#endif
+
 #include <boost/container_hash/hash.hpp>
 #include <boost/core/lightweight_test.hpp>
 #include <string>