diff --git a/progs/demos/morph3d.c b/progs/demos/morph3d.c
index 6aca8270ff5..70b90d733f9 100644
--- a/progs/demos/morph3d.c
+++ b/progs/demos/morph3d.c
@@ -887,5 +887,5 @@ int main(int argc, char **argv)
   glutIdleFunc( idle_ );
   glutDisplayFunc( draw );
   glutMainLoop();
-  
+  return 0;
 }