diff --git a/lib/ivis_opengl/tex.c b/lib/ivis_opengl/tex.c
index ffce0b463..e74a296f3 100644
--- a/lib/ivis_opengl/tex.c
+++ b/lib/ivis_opengl/tex.c
@@ -22,7 +22,7 @@
 #include "lib/framework/frame.h"
 
 #ifdef __APPLE__
-#include <opengl/glu.h>
+#include <OpenGL/glu.h>
 #else
 #include <GL/glu.h>
 #endif
diff --git a/src/texture.c b/src/texture.c
index ccff03493..04d85441f 100644
--- a/src/texture.c
+++ b/src/texture.c
@@ -32,7 +32,7 @@
 #include <physfs.h>
 
 #ifdef __APPLE__
-#include <opengl/glu.h>
+#include <OpenGL/glu.h>
 #else
 #include <GL/glu.h>
 #endif
diff --git a/tools/pietoaster/texture.cpp b/tools/pietoaster/texture.cpp
index 609dc8417..e67ecff30 100644
--- a/tools/pietoaster/texture.cpp
+++ b/tools/pietoaster/texture.cpp
@@ -20,7 +20,7 @@
 
 #include <SDL_opengl.h>
 #ifdef __APPLE__
-#include <opengl/glu.h>
+#include <OpenGL/glu.h>
 #else
 #include <GL/glu.h>
 #endif