diff --git a/glm/detail/setup.hpp b/glm/detail/setup.hpp
index 1e4520efb..555c401a6 100644
--- a/glm/detail/setup.hpp
+++ b/glm/detail/setup.hpp
@@ -306,6 +306,8 @@
 # else
 # 	define GLM_IF_CONSTEXPR if
 # endif
+#else
+#	define GLM_IF_CONSTEXPR if
 #endif
 
 //