diff --git a/open-sse/translator/formats/gemini.js b/open-sse/translator/formats/gemini.js
index 73b7561c..3fe4eb7b 100644
--- a/open-sse/translator/formats/gemini.js
+++ b/open-sse/translator/formats/gemini.js
@@ -7,7 +7,7 @@ import { OPENAI_BLOCK } from "../schema/index.js";
 export const UNSUPPORTED_SCHEMA_CONSTRAINTS = [
   // Basic constraints (not supported by Gemini API)
   "minLength", "maxLength", "exclusiveMinimum", "exclusiveMaximum",
-  "pattern", "minItems", "maxItems", "format",
+  "minItems", "maxItems", "format",
   // Claude rejects these in VALIDATED mode
   "default", "examples",
   // JSON Schema meta keywords