diff --git a/src/stack.c b/src/stack.c
index e9149b8..ce069ff 100644
--- a/src/stack.c
+++ b/src/stack.c
@@ -57,7 +57,7 @@ stack_pop(struct stack *st)
 	if (!st->size)
 		return NULL;
 
-	return st->item[st->size--];
+	return st->item[--st->size];
 }
 
 int