diff --git a/src/docker-setup.test.ts b/src/docker-setup.test.ts
index 3201c9a8229..c3b9f19dd64 100644
--- a/src/docker-setup.test.ts
+++ b/src/docker-setup.test.ts
@@ -140,7 +140,9 @@ describe("docker-setup.sh", () => {
     const assocCheck = spawnSync(systemBash, ["-c", "declare -A _t=()"], {
       encoding: "utf8",
     });
-    if (assocCheck.status === null || assocCheck.status === 0) {
+    if (assocCheck.status === 0 || assocCheck.status === null) {
+      // Skip runtime check when system bash supports associative arrays
+      // (not Bash 3.2) or when /bin/bash is unavailable (e.g. Windows).
       return;
     }