diff --git a/core/lib/upload/um-file-upload.php b/core/lib/upload/um-file-upload.php
index 8ea1e464..5d7bac06 100644
--- a/core/lib/upload/um-file-upload.php
+++ b/core/lib/upload/um-file-upload.php
@@ -24,7 +24,7 @@ if(isset($_FILES[$id]['name'])) {
 		$temp = $_FILES[$id]["tmp_name"];
 		$file = $_FILES[$id]["name"];
 		$file = sanitize_file_name($file);
-		$extension = pathinfo($file, PATHINFO_EXTENSION);
+		$extension = strtolower( pathinfo($file, PATHINFO_EXTENSION) );
 		
 		$error = $ultimatemember->files->check_file_upload( $temp, $extension, $id );
 		if ( $error ){
diff --git a/core/lib/upload/um-image-upload.php b/core/lib/upload/um-image-upload.php
index d87f270d..a6bb337f 100644
--- a/core/lib/upload/um-image-upload.php
+++ b/core/lib/upload/um-image-upload.php
@@ -24,7 +24,7 @@ if(isset($_FILES[$id]['name'])) {
 		$temp = $_FILES[$id]["tmp_name"];
 		$file = $_FILES[$id]["name"];
 		$file = sanitize_file_name($file);
-		 $ext = pathinfo($file, PATHINFO_EXTENSION);
+		 $ext = strtolower( pathinfo($file, PATHINFO_EXTENSION) );
 
 		$error = $ultimatemember->files->check_image_upload( $temp, $id );
 		if ( $error ){