diff --git a/src/earthkit/data/sources/forcings.py b/src/earthkit/data/sources/forcings.py
index be2956019..b1ae66758 100644
--- a/src/earthkit/data/sources/forcings.py
+++ b/src/earthkit/data/sources/forcings.py
@@ -281,7 +281,7 @@ def make_datetime(date, time):
         return date
     if date.hour or date.minute:
         raise ValueError(
-            (f"Duplicate information about time time={time},and time={date.hour}:{date.minute} from date={date}")
+            (f"Duplicate information about time time={time}, and time={date.hour}:{date.minute} from date={date}")
         )
     assert date.hour == 0, (date, time)
     assert date.minute == 0, (date, time)