diff --git a/src/popupmnu.c b/src/popupmnu.c
index 77460a1..447f789 100644
--- a/src/popupmnu.c
+++ b/src/popupmnu.c
@@ -836,7 +836,7 @@
 	item->bytelen = p - item->start;
 	if (item->cells > max_cells)
 	    max_cells = item->cells;
-	long_item_count += item->cells / BALLOON_MIN_WIDTH;
+	long_item_count += (item->cells - 1) / BALLOON_MIN_WIDTH;
     }
 
     height = 2 + ga.ga_len;