diff --git a/diff.c b/diff.c
index e0ebddfac9..c29b1cce14 100644
--- a/diff.c
+++ b/diff.c
@@ -5852,8 +5852,8 @@ static void diff_flush_patch_all_file_pairs(struct diff_options *o)
 			if (o->color_moved == COLOR_MOVED_ZEBRA_DIM)
 				dim_moved_lines(o);
 
-			hashmap_free(&add_lines, 0);
-			hashmap_free(&del_lines, 0);
+			hashmap_free(&add_lines, 1);
+			hashmap_free(&del_lines, 1);
 		}
 
 		for (i = 0; i < esm.nr; i++)