diff --git a/src/Services/Attachments/AttachmentSubmitHandler.php b/src/Services/Attachments/AttachmentSubmitHandler.php
index 2e40f1f5..1b90091f 100644
--- a/src/Services/Attachments/AttachmentSubmitHandler.php
+++ b/src/Services/Attachments/AttachmentSubmitHandler.php
@@ -543,8 +543,10 @@ class AttachmentSubmitHandler
             return $attachment;
         }
 
+        $guessed_mime_type = $this->mimeTypes->guessMimeType($path);
+
         //Check if the file is an SVG
-        if ($attachment->getExtension() === "svg") {
+        if ($guessed_mime_type === "image/svg+xml" || $attachment->getExtension() === "svg") {
             $this->SVGSanitizer->sanitizeFile($path);
         }