diff --git a/services/filestore/test/unit/js/GcsPersistorTests.js b/services/filestore/test/unit/js/GcsPersistorTests.js
index 6264fad0ff..1a22971ddd 100644
--- a/services/filestore/test/unit/js/GcsPersistorTests.js
+++ b/services/filestore/test/unit/js/GcsPersistorTests.js
@@ -138,7 +138,7 @@ describe('GcsPersistorTests', function() {
         'metrics-sharelatex': Metrics,
         crypto
       },
-      globals: { console }
+      globals: { console, Buffer }
     })
   })