diff --git a/auto/src/glew_head.h b/auto/src/glew_head.h
index 4d95656..ac72d63 100644
--- a/auto/src/glew_head.h
+++ b/auto/src/glew_head.h
@@ -98,7 +98,6 @@ typedef _W64 int ptrdiff_t;
 #endif
 
 #ifndef GLEWAPIENTRY
-#define GLEWAPIENTRY_DEFINED
 #define GLEWAPIENTRY APIENTRY
 #endif
 
@@ -168,7 +167,6 @@ typedef _W64 int ptrdiff_t;
 #endif
 
 #ifndef GLEWAPIENTRY
-#define GLEWAPIENTRY_DEFINED
 #define GLEWAPIENTRY
 #endif
 
diff --git a/auto/src/glew_tail.h b/auto/src/glew_tail.h
index a6a9439..54023e3 100644
--- a/auto/src/glew_tail.h
+++ b/auto/src/glew_tail.h
@@ -58,11 +58,6 @@ GLEWAPI const GLubyte * GLEWAPIENTRY glewGetString (GLenum name);
 #define GLAPIENTRY
 #endif
 
-#ifdef GLEWAPIENTRY_DEFINED
-#undef GLEWAPIENTRY_DEFINED
-#undef GLEWAPIENTRY
-#endif
-
 #ifdef GLEW_CALLBACK_DEFINED
 #undef GLEW_CALLBACK_DEFINED
 #undef CALLBACK