diff --git a/caltech-other/voronoi/src/mod3_main.c b/caltech-other/voronoi/src/mod3_main.c
index ffabd46c60..f2cb7b3d40 100644
--- a/caltech-other/voronoi/src/mod3_main.c
+++ b/caltech-other/voronoi/src/mod3_main.c
@@ -160,7 +160,7 @@ mod3_getnext(void)
 {
   Triple *t;
   if (!triples) 
-    return (void *)0;
+    return (Triple *)0;
   
   {
     struct Triple *u=triples;