diff --git a/Fonderie/glitches.c b/Fonderie/glitches.c
index dfec371..535d720 100644
--- a/Fonderie/glitches.c
+++ b/Fonderie/glitches.c
@@ -160,6 +160,8 @@ for (pass=0; pass<szimg/32; pass++) {
 
 return 0;
 }
+/*   --------------------------------------------------------------   */
+
 int random_blocks(FloatImg *picture, int percent)
 {
 int		x, y;
@@ -168,6 +170,7 @@ if ( (picture->width%16) || (picture->height%16) )
 	{
 	fprintf(stderr, "%s: %d%d bad dims\n", __func__,
 				picture->width, picture->height);
+	return -1;
 	}
 
 for (y=0; y<picture->height; y+=16) {