diff --git a/lib/utils.js b/lib/utils.js
index b0c71fc6..eb10ca45 100644
--- a/lib/utils.js
+++ b/lib/utils.js
@@ -9,7 +9,7 @@ exports.isSQLite = function isSQLite (sequelize) {
 }
 
 exports.getImageMimeType = function getImageMimeType (imagePath) {
-  return mime.contentType(path.extname(imagePath))
+  return mime.lookup(path.extname(imagePath))
 }
 
 exports.isRevealTheme = function isRevealTheme (theme) {