diff --git a/parts/server.py b/parts/server.py
index 0e8da1d..06399fd 100644
--- a/parts/server.py
+++ b/parts/server.py
@@ -207,7 +207,7 @@ def alter(partID):
             datasheet_file = request.files['datasheet-file']
             datasheet_filename = secure_filename(datasheet_file.filename)
             i = 1
-            while os.path.isfile('srv/datasheet/' + datasheet_filename):
+            while os.path.isfile('srv/datasheets/' + datasheet_filename):
                 datasheet_filename = datasheet_filename[:-4] + str(i) + '.pdf'
                 i += 1
             datasheet_file.save('/srv/datasheets/' + datasheet_filename)
@@ -233,7 +233,7 @@ def alter(partID):
             datasheet_file = request.files['datasheet-file']
             datasheet_filename = secure_filename(datasheet_file.filename)
             i = 1
-            while os.path.isfile('srv/datasheet/' + datasheet_filename):
+            while os.path.isfile('srv/datasheets/' + datasheet_filename):
                 datasheet_filename = datasheet_filename[:-4] + str(i) + '.pdf'
                 i += 1
             datasheet_file.save('/srv/datasheets/' + datasheet_filename)