diff --git a/rowers/dataprep.py b/rowers/dataprep.py
index 9388c84f..62ff6923 100644
--- a/rowers/dataprep.py
+++ b/rowers/dataprep.py
@@ -997,6 +997,11 @@ def new_workout_from_file(r, f2,
         message = "It looks like this file doesn't contain stroke data."
         return (0, message, f2)
 
+    if fileformat == 'kml':
+        os.remove(f2)
+        message = "KML files are not supported"
+        return (0, message, f2)
+    
     # Some people upload corrupted zip files
     if fileformat == 'notgzip':
         os.remove(f2)