diff --git a/property_tests/arbitraries/js_function_name_arb.ts b/property_tests/arbitraries/js_function_name_arb.ts
index 7648268231..e77aaf5ac7 100644
--- a/property_tests/arbitraries/js_function_name_arb.ts
+++ b/property_tests/arbitraries/js_function_name_arb.ts
@@ -8,6 +8,7 @@ const rustKeywords = [
     'dyn',
     'else',
     'enum',
+    'Err',
     'extern',
     'false',
     'fn',
@@ -21,6 +22,7 @@ const rustKeywords = [
     'mod',
     'move',
     'mut',
+    'Ok',
     'pub',
     'ref',
     'return',