diff --git a/Common/VR/VRBase.cpp b/Common/VR/VRBase.cpp
index edc9cc84da..284c33aaff 100644
--- a/Common/VR/VRBase.cpp
+++ b/Common/VR/VRBase.cpp
@@ -2,6 +2,7 @@
 
 #include <assert.h>
 #include <stdio.h>
+#include <stdlib.h>
 #include <string.h>
 #include <vector>