diff --git a/debian/tests/installcheck b/debian/tests/installcheck
index f390b06..a301e89 100755
--- a/debian/tests/installcheck
+++ b/debian/tests/installcheck
@@ -8,8 +8,8 @@
 	case $v in
 		# older versions fail on concat, ignore that
 		# ERROR:  function concat(unknown, unknown) does not exist
-		8*|9.0) FAIL="exit 0" ;;
-		*) FAIL="exit 1" ;;
+		8*|9.0) FAIL="true" ;;
+		*) FAIL="false" ;;
 	esac
 	pg_buildext installcheck-$v || $FAIL
 done