diff --git a/contrib/pngminus/png2pnm.c b/contrib/pngminus/png2pnm.c
index f9d5138b7..6a1f52e1a 100644
--- a/contrib/pngminus/png2pnm.c
+++ b/contrib/pngminus/png2pnm.c
@@ -66,7 +66,7 @@ int main (int argc, char *argv[])
           if ((fp_al = fopen (argv[argi], "wb")) == NULL)
           {
             fname_al = argv[argi];
-            fprintf (stderr, "PNM2PNG\n");
+            fprintf (stderr, "PNG2PNM\n");
             fprintf (stderr, "Error:  cannot create alpha-channel file %s\n",
                      argv[argi]);
             exit (1);