diff --git a/src/osgDB/ObjectWrapper.cpp b/src/osgDB/ObjectWrapper.cpp
index 956ed7986..ba77842ba 100644
--- a/src/osgDB/ObjectWrapper.cpp
+++ b/src/osgDB/ObjectWrapper.cpp
@@ -48,8 +48,11 @@
 
 #include <sstream>
 
-#if defined(OSG_GLES1_AVAILABLE) || defined(OSG_GLES2_AVAILABLE)
+#ifndef GL_PERSPECTIVE_CORRECTION_HINT
     #define GL_PERSPECTIVE_CORRECTION_HINT      0x0C50
+#endif
+
+#if defined(OSG_GLES1_AVAILABLE) || defined(OSG_GLES2_AVAILABLE)
     #define GL_POLYGON_SMOOTH_HINT              0x0C53
     #define GL_LINE_SMOOTH_HINT                 0x0C52
     #define GL_FRAGMENT_SHADER_DERIVATIVE_HINT  0x8B8B