diff --git a/include/fmt/format.h b/include/fmt/format.h
index f9d9f683..0f15024c 100644
--- a/include/fmt/format.h
+++ b/include/fmt/format.h
@@ -905,7 +905,7 @@ constexpr const char* digits2(size_t value) {
 
 // Sign is a template parameter to workaround a bug in gcc 4.8.
 template <typename Char, typename Sign> constexpr Char sign(Sign s) {
-#if !FMT_GCC_VERSION || FMT_GCC_VERSION > 408
+#if !FMT_GCC_VERSION || FMT_GCC_VERSION >= 604
   static_assert(std::is_same<Sign, sign_t>::value, "");
 #endif
   return static_cast<Char>("\0-+ "[s]);