diff --git a/mach/z8000/libbc/compmodule b/mach/z8000/libbc/compmodule
index 28461326..081a9755 100755
--- a/mach/z8000/libbc/compmodule
+++ b/mach/z8000/libbc/compmodule
@@ -1,2 +1,4 @@
-${MACH?} -I../../../h ${MACHFL?} $1 1>&2
-echo `basename $1 $2`.s
+if ${MACH?ack} -I../../../h ${MACHFL?} $1 1>&2
+then echo `basename $1 $2`.s
+else exit 1
+fi