diff --git a/include/fmt/format.h b/include/fmt/format.h
index ab19c85a..5ce68bff 100644
--- a/include/fmt/format.h
+++ b/include/fmt/format.h
@@ -157,7 +157,7 @@
 #endif
 
 // A workaround for gcc 4.4 that doesn't support union members with ctors.
-#if FMT_GCC_VERSION && FMT_GCC_VERSION <= 404
+#if (FMT_GCC_VERSION && FMT_GCC_VERSION <= 404) && !defined(__clang__)
 # define FMT_UNION struct
 #else
 # define FMT_UNION union