diff --git a/packages/util-endpoints/src/lib/aws/parseArn.spec.ts b/packages/util-endpoints/src/lib/aws/parseArn.spec.ts
index baf39be11c37..3b715868c92f 100644
--- a/packages/util-endpoints/src/lib/aws/parseArn.spec.ts
+++ b/packages/util-endpoints/src/lib/aws/parseArn.spec.ts
@@ -14,6 +14,16 @@ describe(parseArn.name, () => {
         resourceId: ["accesspoint", "myendpoint"],
       },
     ],
+    [
+      "arn:aws:s3:us-west-2:123456789012::myendpoint",
+      {
+        partition: "aws",
+        service: "s3",
+        region: "us-west-2",
+        accountId: "123456789012",
+        resourceId: ["", "myendpoint"],
+      },
+    ],
     [
       "arn:aws:s3:us-west-2:123456789012:accesspoint/myendpoint",
       {
diff --git a/packages/util-endpoints/src/lib/aws/parseArn.ts b/packages/util-endpoints/src/lib/aws/parseArn.ts
index 798d9097b2ed..99ce11f55c65 100644
--- a/packages/util-endpoints/src/lib/aws/parseArn.ts
+++ b/packages/util-endpoints/src/lib/aws/parseArn.ts
@@ -1,24 +1,31 @@
 import { EndpointARN } from "@smithy/types";
 
+const ARN_DELIMITER = ":";
+const RESOURCE_DELIMITER = "/";
+
 /**
  * Evaluates a single string argument value, and returns an object containing
  * details about the parsed ARN.
  * If the input was not a valid ARN, the function returns null.
  */
 export const parseArn = (value: string): EndpointARN | null => {
-  const segments = value.split(":");
+  const segments = value.split(ARN_DELIMITER);
 
   if (segments.length < 6) return null;
 
-  const [arn, partition, service, region, accountId, ...resourceId] = segments;
+  const [arn, partition, service, region, accountId, ...resourcePath] = segments;
+
+  if (arn !== "arn" || partition === "" || service === "" || resourcePath.join(ARN_DELIMITER) === "") return null;
 
-  if (arn !== "arn" || partition === "" || service === "" || resourceId[0] === "") return null;
+  const resourceId = resourcePath[0].includes(RESOURCE_DELIMITER)
+    ? resourcePath[0].split(RESOURCE_DELIMITER)
+    : resourcePath;
 
   return {
     partition,
     service,
     region,
     accountId,
-    resourceId: resourceId[0].includes("/") ? resourceId[0].split("/") : resourceId,
+    resourceId,
   };
 };
diff --git a/tests/endpoints-2.0/endpoints-integration.spec.ts b/tests/endpoints-2.0/endpoints-integration.spec.ts
index 2b6376043245..cae14cbd475d 100644
--- a/tests/endpoints-2.0/endpoints-integration.spec.ts
+++ b/tests/endpoints-2.0/endpoints-integration.spec.ts
@@ -82,10 +82,7 @@ function runTestCases(service: ServiceModel, namespace: ServiceNamespace) {
             const observedError = await (async () => defaultEndpointResolver(endpointParams as any))().catch(pass);
             expect(observedError).not.toBeUndefined();
             expect(observedError?.url).toBeUndefined();
-            // ToDo: debug why 'client-s3 > empty arn type' test case is failing
-            if (serviceId !== "s3" && documentation !== "empty arn type") {
-              expect(normalizeQuotes(String(observedError))).toContain(normalizeQuotes(error));
-            }
+            expect(normalizeQuotes(String(observedError))).toContain(normalizeQuotes(error));
           }
         }
       });