diff --git a/tests/scripts/all.sh b/tests/scripts/all.sh
index a9b1e94..372ef7a 100755
--- a/tests/scripts/all.sh
+++ b/tests/scripts/all.sh
@@ -1624,7 +1624,7 @@
 
     # Restore the build tree to a clean state.
     cleanup
-    current_component=""
+    unset current_component
 }
 
 # Preliminary setup