diff --git a/test/runner/filters/unified_filter.js b/test/runner/filters/unified_filter.js
index <HASH>..<HASH> 100644
--- a/test/runner/filters/unified_filter.js
+++ b/test/runner/filters/unified_filter.js
@@ -17,7 +17,7 @@ class UnifiedTopologyFilter {
 
     return (
       typeof unifiedTopology !== 'boolean' ||
-      unifiedTopology === process.env.MONGODB_UNIFIED_TOPOLOGY
+      unifiedTopology === !!process.env.MONGODB_UNIFIED_TOPOLOGY
     );
   }
 }
test: allow values other than `true` for unified filter