diff --git a/src/util.h b/src/util.h
index f255a4f1..5655b1c0 100644
--- a/src/util.h
+++ b/src/util.h
@@ -4,6 +4,8 @@
 #include <deque>
 #include <mutex>
 
+#include <glm/glm.hpp>
+
 #ifdef _DEBUG
 #define GL(stmt) stmt; check_OpenGLError(#stmt, __FILE__, __LINE__);
 #else