diff --git a/glm/ext.hpp b/glm/ext.hpp
index 03d38864..164dc2a1 100644
--- a/glm/ext.hpp
+++ b/glm/ext.hpp
@@ -214,7 +214,11 @@
 #include "./gtx/functions.hpp"
 #include "./gtx/gradient_paint.hpp"
 #include "./gtx/handed_coordinate_space.hpp"
+
+#if __cplusplus >= 201103L
 #include "./gtx/hash.hpp"
+#endif
+
 #include "./gtx/integer.hpp"
 #include "./gtx/intersect.hpp"
 #include "./gtx/io.hpp"
diff --git a/test/gtx/gtx_quaternion.cpp b/test/gtx/gtx_quaternion.cpp
index 80cbbacd..ed90faa3 100644
--- a/test/gtx/gtx_quaternion.cpp
+++ b/test/gtx/gtx_quaternion.cpp
@@ -5,7 +5,6 @@
 #include <glm/gtx/transform.hpp>
 #include <glm/gtx/quaternion.hpp>
 #include <glm/gtx/compatibility.hpp>
-#include <glm/ext.hpp>
 
 int test_quat_fastMix()
 {