diff --git a/lib/modules/datasource/maven/s3.spec.ts b/lib/modules/datasource/maven/s3.spec.ts
index da1426f56af3310e12b8edf35aaa30569253e50d..b8d5d91c9ed57f2925b93f5a650851ddef7da917 100644
--- a/lib/modules/datasource/maven/s3.spec.ts
+++ b/lib/modules/datasource/maven/s3.spec.ts
@@ -8,7 +8,7 @@ import { mockClient } from 'aws-sdk-client-mock';
 import { DateTime } from 'luxon';
 import { ReleaseResult, getPkgReleases } from '..';
 import { Fixtures } from '../../../../test/fixtures';
-import { logger } from '../../../../test/util';
+import { logger } from '../../../logger';
 import * as hostRules from '../../../util/host-rules';
 import { id as versioning } from '../../versioning/maven';
 import { MavenDatasource } from '.';
@@ -113,7 +113,7 @@ describe('modules/datasource/maven/s3', () => {
         const res = await get('org.example:package', baseUrlS3);
 
         expect(res).toBeNull();
-        expect(logger.logger.debug).toHaveBeenCalledWith(
+        expect(logger.debug).toHaveBeenCalledWith(
           {
             failedUrl: 's3://repobucket/org/example/package/maven-metadata.xml',
           },
@@ -132,7 +132,7 @@ describe('modules/datasource/maven/s3', () => {
         const res = await get('org.example:package', baseUrlS3);
 
         expect(res).toBeNull();
-        expect(logger.logger.debug).toHaveBeenCalledWith(
+        expect(logger.debug).toHaveBeenCalledWith(
           {
             failedUrl: 's3://repobucket/org/example/package/maven-metadata.xml',
           },
@@ -151,7 +151,7 @@ describe('modules/datasource/maven/s3', () => {
         const res = await get('org.example:package', baseUrlS3);
 
         expect(res).toBeNull();
-        expect(logger.logger.trace).toHaveBeenCalledWith(
+        expect(logger.trace).toHaveBeenCalledWith(
           {
             failedUrl: 's3://repobucket/org/example/package/maven-metadata.xml',
           },
@@ -170,7 +170,7 @@ describe('modules/datasource/maven/s3', () => {
         const res = await get('org.example:package', baseUrlS3);
 
         expect(res).toBeNull();
-        expect(logger.logger.trace).toHaveBeenCalledWith(
+        expect(logger.trace).toHaveBeenCalledWith(
           {
             failedUrl: 's3://repobucket/org/example/package/maven-metadata.xml',
           },
@@ -189,7 +189,7 @@ describe('modules/datasource/maven/s3', () => {
         const res = await get('org.example:package', baseUrlS3);
 
         expect(res).toBeNull();
-        expect(logger.logger.debug).toHaveBeenCalledWith(
+        expect(logger.debug).toHaveBeenCalledWith(
           {
             failedUrl: 's3://repobucket/org/example/package/maven-metadata.xml',
             message: 'Unknown error',
@@ -197,6 +197,19 @@ describe('modules/datasource/maven/s3', () => {
           'Unknown S3 download error'
         );
       });
+
+      it('returns null for unexpected response type', async () => {
+        s3mock
+          .on(GetObjectCommand, {
+            Bucket: 'repobucket',
+            Key: 'org/example/package/maven-metadata.xml',
+          })
+          .resolvesOnce({});
+        expect(await get('org.example:package', baseUrlS3)).toBeNull();
+        expect(logger.debug).toHaveBeenCalledWith(
+          "Expecting Readable response type got 'undefined' type instead"
+        );
+      });
     });
   });
 });
diff --git a/lib/modules/datasource/maven/util.ts b/lib/modules/datasource/maven/util.ts
index 27cedda4b67e585d582308020f30199551267460..efd92438862ed0aceaec9b13aa5fe679b04a5bfd 100644
--- a/lib/modules/datasource/maven/util.ts
+++ b/lib/modules/datasource/maven/util.ts
@@ -1,4 +1,3 @@
-import { Blob } from 'buffer';
 import { Readable } from 'stream';
 import { DateTime } from 'luxon';
 import { XmlDocument } from 'xmldoc';
@@ -114,15 +113,12 @@ export async function downloadS3Protocol(pkgUrl: URL): Promise<string | null> {
       return null;
     }
     const { Body: res } = await getS3Client().getObject(s3Url);
-
-    // istanbul ignore if
-    if (res instanceof Blob) {
-      return res.toString();
-    }
-
     if (res instanceof Readable) {
       return streamToString(res);
     }
+    logger.debug(
+      `Expecting Readable response type got '${typeof res}' type instead`
+    );
   } catch (err) {
     const failedUrl = pkgUrl.toString();
     if (err.name === 'CredentialsProviderError') {