diff --git a/src/framework/processing/py_worker.js b/src/framework/processing/py_worker.js
index 70ec0542..f6d79c14 100755
--- a/src/framework/processing/py_worker.js
+++ b/src/framework/processing/py_worker.js
@@ -60,15 +60,21 @@ function unwrap(response) {
 }
 
 function copyFileToPyFS(file, resolve) {
-  self.pyodide.FS.mkdir('/file-input')
+  directoryName = `/file-input`
+  pathStats = self.pyodide.FS.analyzePath(directoryName)
+  if (!pathStats.exists) {
+    self.pyodide.FS.mkdir(directoryName)
+  } else {
+    self.pyodide.FS.unmount(directoryName)
+  }
   self.pyodide.FS.mount(
     self.pyodide.FS.filesystems.WORKERFS,
     {
       files: [file]
     },
-    '/file-input'
+    directoryName
   )
-  resolve({ __type__: 'PayloadString', value: '/file-input/' + file.name })
+  resolve({ __type__: 'PayloadString', value: directoryName + '/' + file.name })
 }
 
 function initialise() {