diff --git a/src/hooks/runtime-fallback/constants.ts b/src/hooks/runtime-fallback/constants.ts
index 87d03be5..f3f25956 100644
--- a/src/hooks/runtime-fallback/constants.ts
+++ b/src/hooks/runtime-fallback/constants.ts
@@ -29,9 +29,9 @@ export const RETRYABLE_ERROR_PATTERNS = [
   /overloaded/i,
   /temporarily.?unavailable/i,
   /try.?again/i,
-  /\b429\b/,
-  /\b503\b/,
-  /\b529\b/,
+  /(?:^|\s)429(?:\s|$)/,
+  /(?:^|\s)503(?:\s|$)/,
+  /(?:^|\s)529(?:\s|$)/,
 ]
 
 /**