diff --git a/auto/src/glew_head.h b/auto/src/glew_head.h
index c9f1189..f33f440 100644
--- a/auto/src/glew_head.h
+++ b/auto/src/glew_head.h
@@ -8,6 +8,9 @@
 #if defined(__gl2_h_)
 #error gl2.h included before glew.h
 #endif
+#if defined(__gltypes_h_)
+#error gltypes.h included before glew.h
+#endif
 #if defined(__REGAL_H__)
 #error Regal.h included before glew.h
 #endif
@@ -21,6 +24,7 @@
 #define __gl_h_
 #define __gl2_h_
 #define __GL_H__
+#define __gltypes_h_
 #define __REGAL_H__
 #define __X_GL_H
 #define __glext_h_