diff --git a/include/fmt/core.h b/include/fmt/core.h
index 8580cc93..66597eed 100644
--- a/include/fmt/core.h
+++ b/include/fmt/core.h
@@ -134,7 +134,8 @@
 #endif
 
 #ifndef FMT_BEGIN_NAMESPACE
-# if FMT_HAS_FEATURE(cxx_inline_namespaces) || FMT_MSC_VER >= 1900
+# if FMT_HAS_FEATURE(cxx_inline_namespaces) || FMT_GCC_VERSION >= 404 || \
+     FMT_MSC_VER >= 1900
 #  define FMT_INLINE_NAMESPACE inline namespace
 #  define FMT_END_NAMESPACE }}
 # else