diff --git a/src/catalog/src/builtin.rs b/src/catalog/src/builtin.rs
index 1b728100a820c..11baad09d77ca 100644
--- a/src/catalog/src/builtin.rs
+++ b/src/catalog/src/builtin.rs
@@ -5617,9 +5617,10 @@ FROM
     mz_introspection.mz_dataflow_addresses_per_worker addr1,
     mz_introspection.mz_dataflow_addresses_per_worker addr2
 WHERE
+    addr2.address =
     CASE
-        WHEN source = 0 THEN addr2.address = addr1.address
-        ELSE addr2.address = addr1.address || reachability.source
+        WHEN source = 0 THEN addr1.address
+        ELSE addr1.address || reachability.source
     END
     AND addr1.id = reachability.id
     AND addr1.worker_id = reachability.worker_id