diff --git a/STL_Extension/include/CGAL/hash_openmesh.h b/STL_Extension/include/CGAL/hash_openmesh.h
index 0efbff824c8..7d12891a62c 100644
--- a/STL_Extension/include/CGAL/hash_openmesh.h
+++ b/STL_Extension/include/CGAL/hash_openmesh.h
@@ -22,7 +22,7 @@
 
 #include <OpenMesh/Core/Mesh/Handles.hh>
 
-#if OMVERSION < 0x60200
+#if OM_VERSION < 0x60200
 
 namespace OpenMesh {