diff --git a/glm/ext/quaternion_exponential.inl b/glm/ext/quaternion_exponential.inl
index 437a3b6e..570aa2c4 100644
--- a/glm/ext/quaternion_exponential.inl
+++ b/glm/ext/quaternion_exponential.inl
@@ -1,4 +1,5 @@
 #include "scalar_constants.hpp"
+#include "quaternion_layout.hpp"
 
 namespace glm
 {