diff --git a/glm/detail/setup.hpp b/glm/detail/setup.hpp
index 5f2e7185..bde13ba0 100644
--- a/glm/detail/setup.hpp
+++ b/glm/detail/setup.hpp
@@ -295,8 +295,10 @@
 
 //
 #if GLM_HAS_CONSTEXPR
-# if (GLM_COMPILER & GLM_COMPILER_CLANG )
+# if (GLM_COMPILER & GLM_COMPILER_CLANG)
 #	define GLM_HAS_IF_CONSTEXPR __has_feature(cxx_if_constexpr)
+# elif (GLM_COMPILER & GLM_COMPILER_GCC) 
+#	define GLM_HAS_IF_CONSTEXPR GLM_COMPILER >= GLM_COMPILER_GCC7
 # elif GLM_LANG_CXX17_FLAG
 # 	define GLM_HAS_IF_CONSTEXPR 1
 # else