diff --git a/buildbot.json b/buildbot.json
index 93c3a9514..e1f2669e2 100644
--- a/buildbot.json
+++ b/buildbot.json
@@ -14,6 +14,6 @@
     "test": {
         "after": ["install"],
         "package": "spacy",
-        "args": "--tb='native' -x --models --vectors --slow"
+        "args": "--tb=native -x --models --vectors --slow"
     }
 }