diff --git a/modules/juce_opengl/native/juce_OpenGLExtensions.h b/modules/juce_opengl/native/juce_OpenGLExtensions.h
index f82c55ddc5..3245081079 100644
--- a/modules/juce_opengl/native/juce_OpenGLExtensions.h
+++ b/modules/juce_opengl/native/juce_OpenGLExtensions.h
@@ -114,8 +114,8 @@ enum
 };
 
 typedef char GLchar;
-typedef long GLsizeiptr;
-typedef long GLintptr;
+typedef pointer_sized_int GLsizeiptr;
+typedef pointer_sized_int GLintptr;
 
 #define WGL_FUNCTION_LIST(USE_FUNCTION) \
     USE_FUNCTION (wglChoosePixelFormatARB,  BOOL, (HDC, const int*, const FLOAT*, UINT, int*, UINT*))\