diff --git a/packages/util-endpoints/src/lib/aws/partitions.json b/packages/util-endpoints/src/lib/aws/partitions.json
index 712d31e3fe55a..a2f0680888e20 100644
--- a/packages/util-endpoints/src/lib/aws/partitions.json
+++ b/packages/util-endpoints/src/lib/aws/partitions.json
@@ -9,7 +9,7 @@
       "supportsDualStack" : true,
       "supportsFIPS" : true
     },
-    "regionRegex" : "^(us|eu|ap|sa|ca|me|af|il)\\-\\w+\\-\\d+$",
+    "regionRegex" : "^(us|eu|ap|sa|ca|me|af|il|mx)\\-\\w+\\-\\d+$",
     "regions" : {
       "af-south-1" : {
         "description" : "Africa (Cape Town)"