diff --git a/mocha-common/build b/mocha-common/build
index fa7fd4d..f21a73f 100755
--- a/mocha-common/build
+++ b/mocha-common/build
@@ -20,9 +20,10 @@ for p in $PROJECTS; do
 	fi
 
 	./yaml2mcl --export-entities=output/$p.cs -o output/$p.mcl data/libraries/yaml/$p
-	if [ ! $? -eq 0 ]; then
+	Q=$?
+	if [ $Q -ne 0 ]; then
 		echo "error MCX9911 : build failed"
-		exit
+		exit $Q
 	fi
 
 done