diff --git a/plugins/image-dialog/image-dialog.js b/plugins/image-dialog/image-dialog.js
index b4eca95..68da892 100644
--- a/plugins/image-dialog/image-dialog.js
+++ b/plugins/image-dialog/image-dialog.js
@@ -129,7 +129,7 @@
 
 				fileInput.bind("change", function() {
 					var fileName  = fileInput.val();
-					var isImage   = new RegExp("(\\.(" + settings.imageFormats.join("|") + "))$"); // /(\.(webp|jpg|jpeg|gif|bmp|png))$/
+					var isImage   = new RegExp("(\\.(" + settings.imageFormats.join("|") + "))$", "i"); // /(\.(webp|jpg|jpeg|gif|bmp|png))$/
 
 					if (fileName === "")
 					{