diff --git a/panda/src/glstuff/glImmediateModeSender_src.h b/panda/src/glstuff/glImmediateModeSender_src.h
index 0b1a77159d..8cd959369d 100644
--- a/panda/src/glstuff/glImmediateModeSender_src.h
+++ b/panda/src/glstuff/glImmediateModeSender_src.h
@@ -45,14 +45,14 @@ public:
   void issue_vertex();
 
   class ComponentSender;
-  typedef void GLAPIENTRY Func1f(GLfloat a);
-  typedef void GLAPIENTRY Func2f(GLfloat a, GLfloat b);
-  typedef void GLAPIENTRY Func3f(GLfloat a, GLfloat b, GLfloat c);
-  typedef void GLAPIENTRY Func4f(GLfloat a, GLfloat b, GLfloat c, GLfloat d);
-  typedef void GLAPIENTRY TexcoordFunc1f(GLenum texture, GLfloat a);
-  typedef void GLAPIENTRY TexcoordFunc2f(GLenum texture, GLfloat a, GLfloat b);
-  typedef void GLAPIENTRY TexcoordFunc3f(GLenum texture, GLfloat a, GLfloat b, GLfloat c);
-  typedef void GLAPIENTRY TexcoordFunc4f(GLenum texture, GLfloat a, GLfloat b, GLfloat c, GLfloat d);
+  typedef void APIENTRY Func1f(GLfloat a);
+  typedef void APIENTRY Func2f(GLfloat a, GLfloat b);
+  typedef void APIENTRY Func3f(GLfloat a, GLfloat b, GLfloat c);
+  typedef void APIENTRY Func4f(GLfloat a, GLfloat b, GLfloat c, GLfloat d);
+  typedef void APIENTRY TexcoordFunc1f(GLenum texture, GLfloat a);
+  typedef void APIENTRY TexcoordFunc2f(GLenum texture, GLfloat a, GLfloat b);
+  typedef void APIENTRY TexcoordFunc3f(GLenum texture, GLfloat a, GLfloat b, GLfloat c);
+  typedef void APIENTRY TexcoordFunc4f(GLenum texture, GLfloat a, GLfloat b, GLfloat c, GLfloat d);
 
   bool add_column(const GeomVertexData *vertex_data, const InternalName *name,
                   Func1f *func1f, Func2f *func2f, Func3f *func3f, Func4f *func4f);