diff --git a/include/GL/gl.h b/include/GL/gl.h
index 2235f223fa7..0efa6ef81d0 100644
--- a/include/GL/gl.h
+++ b/include/GL/gl.h
@@ -113,10 +113,6 @@
 #define GLAPIENTRYP GLAPIENTRY *
 #endif
 
-#ifdef CENTERLINE_CLPP
-#define signed
-#endif
-
 #if defined(PRAGMA_EXPORT_SUPPORTED)
 #pragma export on
 #endif