diff --git a/src/node/handler/ImportHandler.js b/src/node/handler/ImportHandler.js
index 6caf7ba93..35ceddfdd 100644
--- a/src/node/handler/ImportHandler.js
+++ b/src/node/handler/ImportHandler.js
@@ -114,7 +114,7 @@ const doImport = async (req, res, padId, authorId) => {
 
   // ensure this is a file ending we know, else we change the file ending to .txt
   // this allows us to accept source code files like .c or .java
-  const fileEnding = path.extname(srcFile).toLowerCase();
+  const fileEnding = path.extname(files.file[0].originalFilename).toLowerCase();
   const knownFileEndings =
     ['.txt', '.doc', '.docx', '.pdf', '.odt', '.html', '.htm', '.etherpad', '.rtf'];
   const fileEndingUnknown = (knownFileEndings.indexOf(fileEnding) < 0);