diff --git a/tools/lab_dispatch/generic_source.yaml b/tools/lab_dispatch/generic_source.yaml
index 655c99ef33..1cd0abf8dc 100644
--- a/tools/lab_dispatch/generic_source.yaml
+++ b/tools/lab_dispatch/generic_source.yaml
@@ -50,7 +50,7 @@ test_data:
     _run wait_for_packages_complete
 
     git_get_shallow https://github.com/canonical/checkbox.git commit $CHECKBOX_REVISION
-    pipx install --spec checkbox/checkbox-ng checkbox-ng
+    pipx install checkbox/checkbox-ng
 
     # retrieve manifest
     MANIFEST_FILE=manifest.conf