diff --git a/include/aws/auth/credentials.h b/include/aws/auth/credentials.h
index 7cd74912..86547297 100644
--- a/include/aws/auth/credentials.h
+++ b/include/aws/auth/credentials.h
@@ -277,7 +277,7 @@ struct aws_credentials_provider_ecs_options {
     /*
      * Port to query credentials from.  If zero, 80/443 will be used based on whether or not tls is enabled.
      */
-    uint16_t port;
+    uint32_t port;
 };
 
 /**
diff --git a/tests/credentials_provider_ecs_tests.c b/tests/credentials_provider_ecs_tests.c
index e94941a5..dd311409 100644
--- a/tests/credentials_provider_ecs_tests.c
+++ b/tests/credentials_provider_ecs_tests.c
@@ -32,7 +32,7 @@ struct aws_mock_ecs_tester {
     struct aws_credentials *credentials;
     bool has_received_credentials_callback;
     bool has_received_shutdown_callback;
-    uint16_t selected_port;
+    uint32_t selected_port;
 
     int error_code;
 };