diff --git a/include/osg/GLU b/include/osg/GLU
index 709884a50..8a16f6b9e 100644
--- a/include/osg/GLU
+++ b/include/osg/GLU
@@ -107,7 +107,7 @@ extern OSG_EXPORT GLint gluBuild3DMipmaps (GLenum target, GLint internalFormat,
 #define GLU_TESS_WINDING_NEGATIVE          100133
 #define GLU_TESS_WINDING_ABS_GEQ_TWO       100134
 
-class GLUtesselator;
+struct GLUtesselator;
 typedef GLUtesselator GLUtesselatorObj;
 typedef GLUtesselator GLUtriangulatorObj;