diff --git a/src/day04.rs b/src/day04.rs
index 4f66845..5b069ce 100644
--- a/src/day04.rs
+++ b/src/day04.rs
@@ -23,7 +23,7 @@ fn contains_range(slf: &RangeInclusive<u64>, other: &RangeInclusive<u64>) -> boo
 }
 
 fn overlaps_with_range(slf: &RangeInclusive<u64>, other: &RangeInclusive<u64>) -> bool {
-    slf.contains(other.start())
+    slf.contains(other.start()) || slf.contains(other.end())
 }
 
 #[aoc(day4, part1)]