diff --git a/babybuddy/formats/en/formats.py b/babybuddy/formats/en/formats.py
index a3556b47..f8901d3b 100644
--- a/babybuddy/formats/en/formats.py
+++ b/babybuddy/formats/en/formats.py
@@ -2,4 +2,4 @@
 
 # Add custom "short" version of `MONTH_DAY_FORMAT`. This customization will
 # only work with the locale format locale specified by this file.
-SHORT_MONTH_DAY_FORMAT = 'M j'
+SHORT_MONTH_DAY_FORMAT = "M j"