diff --git a/stack.c b/stack.c
index d538b8462e116136bed1d5ac8c5a1b1cfd79efbf..fc4205b03f83906530ccc57a6e49d70d1683bb95 100644
--- a/stack.c
+++ b/stack.c
@@ -1,4 +1,6 @@
 #include <stdlib.h>
+#include "stack.h"
+
 
 #define DEFAULT_CAPACITY 4