diff --git a/demo/src/Common/geomview-graphics.c b/demo/src/Common/geomview-graphics.c
index dadd46e1b973cd7cdbf9ff8893026971e04f68ea..9baae18cd43ed2453dfa138532daabaf63acec14 100644
--- a/demo/src/Common/geomview-graphics.c
+++ b/demo/src/Common/geomview-graphics.c
@@ -621,7 +621,7 @@ void mesh2off_1d(FILE *gvf,
   if (mesh->parametric) {
     bool not_all, fast = false;
 
-    not_all = mesh->parametric->not_all && !ref_deg == 1;
+    not_all = mesh->parametric->not_all && !(ref_deg == 1);
 
     if ((coords = get_lagrange_coords(mesh)) != NULL) {