diff --git a/program/filters.py b/program/filters.py
index 94f4f9ec4061e831c515bd48c5702c2d7957c8bb..d442c2acc34d4669dcc5c90c4ad08bcf857b82a2 100644
--- a/program/filters.py
+++ b/program/filters.py
@@ -302,7 +302,7 @@ class VirtualTimeslotFilterSet(filters.FilterSet):
     end = filters.IsoDateTimeFilter(method="filter_noop")
     cut_at_range_boundaries = filters.BooleanFilter(
         help_text=(
-            "If true guarantees that the first and last program entry match the requested range"
+            "If true guarantees that the first and last program entry match the requested range "
             "even if these entries earlier or end later."
         ),
         method="filter_noop",