diff --git a/cameo/templates/mkmk-simple b/cameo/templates/mkmk-simple
index 2b2a912..a11003e 100755
--- a/cameo/templates/mkmk-simple
+++ b/cameo/templates/mkmk-simple
@@ -44,7 +44,7 @@ while [ $yi -lt $YN ]; do
     xi=0
     while [ $xi -lt $XN ]; do
 
-	cameo <<EOF
+	cameo <<EOF || exit
 mm
 
 gerber 35mil ../$NAME-PCB_Edges.gbr