diff --git a/source/glbackend/glbackend.h b/source/glbackend/glbackend.h
index 9f109c2a2..3692f9a67 100644
--- a/source/glbackend/glbackend.h
+++ b/source/glbackend/glbackend.h
@@ -1,4 +1,5 @@
 #pragma once
+#include <limits.h>
 #include <stdlib.h>
 #include <algorithm>
 #include <vector>
diff --git a/source/glbackend/pm_renderstate.h b/source/glbackend/pm_renderstate.h
index c1d45580b..1c20f2383 100644
--- a/source/glbackend/pm_renderstate.h
+++ b/source/glbackend/pm_renderstate.h
@@ -1,5 +1,6 @@
 #pragma once
 
+#include <limits.h>
 #include "palentry.h"
 #include "gl_buffers.h"
 #include "renderstyle.h"