diff --git a/engine/gl/glsupp.h b/engine/gl/glsupp.h
index f9d146017..5f0885781 100644
--- a/engine/gl/glsupp.h
+++ b/engine/gl/glsupp.h
@@ -384,6 +384,12 @@ typedef GLboolean (APIENTRYP PFNGLISPROGRAMARBPROC) (GLuint program);
 /* All ARB_fragment_program entry points are shared with ARB_vertex_program. */
 #endif
 
+#ifndef GL_SGIS_generate_mipmap
+#define GL_SGIS_generate_mipmap 1
+
+#define GL_GENERATE_MIPMAP_SGIS           0x8191
+#define GL_GENERATE_MIPMAP_HINT_SGIS      0x8192
+#endif
 
 
 #endif