diff --git a/BBGE/GL/gl.h b/BBGE/GL/gl.h
index a4614ed..5681f67 100644
--- a/BBGE/GL/gl.h
+++ b/BBGE/GL/gl.h
@@ -31,7 +31,10 @@ extern "C" {
 ** the United States.
 */
 
-#ifndef APIENTRY
+#undef APIENTRY
+#ifdef _WIN32
+#define APIENTRY __stdcall
+#else
 #define APIENTRY
 #endif
 
@@ -44,17 +47,6 @@ extern "C" {
 #undef WINGDIAPI
 #define WINGDIAPI extern
 
-
-
-#ifndef GLAPI
-# ifdef _WIN32
-#  define GLAPI __stdcall
-# else
-#  define GLAPI
-# endif
-# define __DEFINED_GLAPI
-#endif
-
 /*************************************************************/
 
 typedef unsigned int GLenum;
@@ -1628,11 +1620,6 @@ WINGDIAPI void APIENTRY glVertex4sv (const GLshort *v);
 WINGDIAPI void APIENTRY glVertexPointer (GLint size, GLenum type, GLsizei stride, const GLvoid *pointer);
 WINGDIAPI void APIENTRY glViewport (GLint x, GLint y, GLsizei width, GLsizei height);
 
-#ifdef __DEFINED_GLAPI
-# undef GLAPI
-# undef __DEFINED_GLAPI
-#endif
-
 
 #ifdef __cplusplus
 }