diff --git a/stack.c b/stack.c
index 2ab2791..be0b696 100644
--- a/stack.c
+++ b/stack.c
@@ -66,5 +66,8 @@ int main( int argc, char *argv[] ) {
         printf("%d\n",stack_pop(s));
     }
 
+    stack_free(s);
+    s = NULL;
+
 	return 0;
 }