diff --git a/moves/src/generators/pawn.rs b/moves/src/generators/pawn.rs
index 99f5c31..515ab16 100644
--- a/moves/src/generators/pawn.rs
+++ b/moves/src/generators/pawn.rs
@@ -210,7 +210,7 @@ impl std::iter::Iterator for PawnMoveGenerator {
         if let Some(target) = self.target_iterator.next() {
             let origin = self
                 .calculate_origin_square(target)
-                .expect("Bogus origin square");
+                .expect("bogus origin square");
 
             if target.rank().is_promotable_rank() {
                 self.promotion_iterator = Some(PromotionIterator {