diff --git a/build_tools/aws-sdk-code-generator/spec/protocol-tests-ignore-list.json b/build_tools/aws-sdk-code-generator/spec/protocol-tests-ignore-list.json
index 06f1010edb6..b34b4d6b766 100644
--- a/build_tools/aws-sdk-code-generator/spec/protocol-tests-ignore-list.json
+++ b/build_tools/aws-sdk-code-generator/spec/protocol-tests-ignore-list.json
@@ -11,5 +11,14 @@
         "engines": ["nokogiri"]
       }
     }
+  },
+  "query": {
+    "input": {},
+    "output": {
+      "QueryCustomizedError": {
+        "description": "Under investigation",
+        "engines": ["ox", "nokogiri", "rexml", "libxml", "oga"]
+      }
+    }
   }
 }
\ No newline at end of file