diff --git a/include/osg/GLDefines b/include/osg/GLDefines
index b8b1fc152..fa6f82e5f 100644
--- a/include/osg/GLDefines
+++ b/include/osg/GLDefines
@@ -636,6 +636,10 @@ namespace osg
             #endif
         #endif
     #endif
+
+    #if defined(OSG_GLES1_FEATURES) || defined(OSG_GLES2_FEATURES)|| defined(OSG_GLES3_FEATURES)
+        typedef double GLclampd;
+    #endif
 }
 
 #endif