diff --git a/public/js/upload_queue.js b/public/js/upload_queue.js
index 54384f6..506a64b 100644
--- a/public/js/upload_queue.js
+++ b/public/js/upload_queue.js
@@ -18,7 +18,7 @@ class UploadQueue {
 					this.submit.disabled = false;
 				};
 
-				if (this.queue.files[0].name.includes(".HEIC")) {
+				if (this.queue.files[0].name.toUpperCase().endsWith(".HEIC")) {
 					alert('Sorry, the HEIC image format is not supported.\nPlease convert your photos to JPEG before uploading.');
 					this.hideSpinner();
 					this.submit.disabled = false;