diff --git a/api/gutil.cpp b/api/gutil.cpp
index ad4a5d8e8a..58e4dd69f1 100644
--- a/api/gutil.cpp
+++ b/api/gutil.cpp
@@ -470,7 +470,7 @@ void STARFIELD::build_stars(int sz, float sp) {
 	nstars=sz;
 
     if (stars) free(stars);
-    stars = (STAR*)calloc(sizeof(STAR), (long unsigned int)nstars);
+    stars = (STAR*)calloc((long unsigned int)nstars, sizeof(STAR));
     if (!stars) {
         fprintf(stderr, "out of mem in STARFIELD::build_stars");
         sz = 0;