diff --git a/walkthroughs/week-4-libraries/blobstore/examples/hello-world-fetch/src/main/java/com/google/sps/servlets/FormHandlerServlet.java b/walkthroughs/week-4-libraries/blobstore/examples/hello-world-fetch/src/main/java/com/google/sps/servlets/FormHandlerServlet.java
index ecd05c9..c849029 100644
--- a/walkthroughs/week-4-libraries/blobstore/examples/hello-world-fetch/src/main/java/com/google/sps/servlets/FormHandlerServlet.java
+++ b/walkthroughs/week-4-libraries/blobstore/examples/hello-world-fetch/src/main/java/com/google/sps/servlets/FormHandlerServlet.java
@@ -65,7 +65,7 @@ public void doPost(HttpServletRequest request, HttpServletResponse response) thr
   private String getUploadedFileUrl(HttpServletRequest request, String formInputElementName) {
     BlobstoreService blobstoreService = BlobstoreServiceFactory.getBlobstoreService();
     Map<String, List<BlobKey>> blobs = blobstoreService.getUploads(request);
-    List<BlobKey> blobKeys = blobs.get("image");
+    List<BlobKey> blobKeys = blobs.get(formInputElementName);
 
     // User submitted form without selecting a file, so we can't get a URL. (dev server)
     if (blobKeys == null || blobKeys.isEmpty()) {
diff --git a/walkthroughs/week-4-libraries/blobstore/examples/hello-world-jsp/src/main/java/com/google/sps/servlets/FormHandlerServlet.java b/walkthroughs/week-4-libraries/blobstore/examples/hello-world-jsp/src/main/java/com/google/sps/servlets/FormHandlerServlet.java
index c275f9f..affee91 100644
--- a/walkthroughs/week-4-libraries/blobstore/examples/hello-world-jsp/src/main/java/com/google/sps/servlets/FormHandlerServlet.java
+++ b/walkthroughs/week-4-libraries/blobstore/examples/hello-world-jsp/src/main/java/com/google/sps/servlets/FormHandlerServlet.java
@@ -65,7 +65,7 @@ public void doPost(HttpServletRequest request, HttpServletResponse response) thr
   private String getUploadedFileUrl(HttpServletRequest request, String formInputElementName) {
     BlobstoreService blobstoreService = BlobstoreServiceFactory.getBlobstoreService();
     Map<String, List<BlobKey>> blobs = blobstoreService.getUploads(request);
-    List<BlobKey> blobKeys = blobs.get("image");
+    List<BlobKey> blobKeys = blobs.get(formInputElementName);
 
     // User submitted form without selecting a file, so we can't get a URL. (dev server)
     if (blobKeys == null || blobKeys.isEmpty()) {