diff --git a/gems/aws-sdk-core/CHANGELOG.md b/gems/aws-sdk-core/CHANGELOG.md
index c46a4bb0788..10df53e424f 100644
--- a/gems/aws-sdk-core/CHANGELOG.md
+++ b/gems/aws-sdk-core/CHANGELOG.md
@@ -1,6 +1,8 @@
 Unreleased Changes
 ------------------
 
+* Issue - Minor performance optimization.
+
 3.190.1 (2023-12-20)
 ------------------
 
diff --git a/gems/aws-sdk-core/lib/aws-sdk-core/waiters/poller.rb b/gems/aws-sdk-core/lib/aws-sdk-core/waiters/poller.rb
index 906dde6cd39..bd65e640b7d 100644
--- a/gems/aws-sdk-core/lib/aws-sdk-core/waiters/poller.rb
+++ b/gems/aws-sdk-core/lib/aws-sdk-core/waiters/poller.rb
@@ -97,7 +97,7 @@ def matches_status?(acceptor, response)
 
       def matches_error?(acceptor, response)
         Aws::Errors::ServiceError === response.error &&
-        response.error.code == acceptor['expected'].gsub('.', '')
+        response.error.code == acceptor['expected'].delete('.')
       end
 
       def path(acceptor)