diff --git a/src/notes_api.py b/src/notes_api.py
index 7bed830ff..51d635603 100644
--- a/src/notes_api.py
+++ b/src/notes_api.py
@@ -44,7 +44,7 @@ def updateNote(note_id):
 
     now = math.floor(time.time())
 
-    history_snapshot_time_interval = getOption('history_snapshot_time_interval')
+    history_snapshot_time_interval = float(getOption('history_snapshot_time_interval'))
 
     history_cutoff = now - history_snapshot_time_interval