diff --git a/tests/overlay-local-store/common.sh b/tests/overlay-local-store/common.sh
index 5a678c947..0e98e931f 100644
--- a/tests/overlay-local-store/common.sh
+++ b/tests/overlay-local-store/common.sh
@@ -57,5 +57,5 @@ initLowerStore () {
 }
 
 execUnshare () {
-  exec unshare --mount --map-root-user "$@"
+  exec unshare --mount --map-root-user "$SHELL" "$@"
 }