diff --git a/src/main/java/com/saucelabs/saucerest/api/StorageEndpoint.java b/src/main/java/com/saucelabs/saucerest/api/StorageEndpoint.java
index f246ad13..319eaf71 100644
--- a/src/main/java/com/saucelabs/saucerest/api/StorageEndpoint.java
+++ b/src/main/java/com/saucelabs/saucerest/api/StorageEndpoint.java
@@ -267,6 +267,7 @@ private Response postMultipartResponse(String url, File file, String fileName, S
 
     Request request =
         new Request.Builder()
+            .header("User-Agent", userAgent)
             .header("Authorization", credentials)
             .url(url)
             .post(requestBody)
diff --git a/src/test/java/com/saucelabs/saucerest/unit/UserAgentTest.java b/src/test/java/com/saucelabs/saucerest/unit/UserAgentTest.java
new file mode 100644
index 00000000..9a84663b
--- /dev/null
+++ b/src/test/java/com/saucelabs/saucerest/unit/UserAgentTest.java
@@ -0,0 +1,54 @@
+package com.saucelabs.saucerest.unit;
+
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+import com.saucelabs.saucerest.api.HttpClientConfig;
+import com.saucelabs.saucerest.api.StorageEndpoint;
+import java.io.File;
+import java.io.IOException;
+import java.nio.file.Files;
+import java.util.concurrent.atomic.AtomicReference;
+import okhttp3.Request;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.io.TempDir;
+
+public class UserAgentTest {
+  @TempDir File tempDir;
+
+  private StorageEndpoint endpointCapturing(AtomicReference<Request> captured) {
+    StorageEndpoint endpoint = new StorageEndpoint("user", "key", "http://localhost/");
+    endpoint.createHttpClient(
+        HttpClientConfig.defaultConfig()
+            .interceptor(
+                chain -> {
+                  captured.set(chain.request());
+                  throw new IOException("short-circuit");
+                }));
+    return endpoint;
+  }
+
+  private void assertUserAgent(Request request) {
+    assertNotNull(request);
+    String userAgent = request.header("User-Agent");
+    assertNotNull(userAgent);
+    assertTrue(userAgent.startsWith("SauceREST/"), userAgent);
+  }
+
+  @Test
+  void regularRequestSendsUserAgent() {
+    AtomicReference<Request> captured = new AtomicReference<>();
+    assertThrows(IOException.class, () -> endpointCapturing(captured).getFiles());
+    assertUserAgent(captured.get());
+  }
+
+  @Test
+  void multipartUploadSendsUserAgent() throws IOException {
+    File file = new File(tempDir, "app.apk");
+    Files.write(file.toPath(), new byte[] {1, 2, 3});
+    AtomicReference<Request> captured = new AtomicReference<>();
+    assertThrows(IOException.class, () -> endpointCapturing(captured).uploadFile(file));
+    assertUserAgent(captured.get());
+  }
+}