diff --git a/gm/ugm.cc b/gm/ugm.cc
index a7a6f2a7c00c59cef1db17ecc37c37d02a77e44c..288931de90f919e40e8ccec01f707f466e46ca7e 100644
--- a/gm/ugm.cc
+++ b/gm/ugm.cc
@@ -6593,7 +6593,7 @@ INT NS_DIM_PREFIX MultiGridStatus (const MULTIGRID *theMG, INT gridflag, INT gre
       predmax0 = free_bytes/mg_sum_size_div_red;
     else
       predmax0 = free_bytes/
-#ifdef __TWODIMM__
+#ifdef __TWODIM__
                  sizeof(struct quadrilateral);
 #else
                  sizeof(struct hexahedron);