diff --git a/src/Paper-Bin.c b/src/Paper-Bin.c
index b1d45db..900ddb4 100644
--- a/src/Paper-Bin.c
+++ b/src/Paper-Bin.c
@@ -1,4 +1,5 @@
 #include <stdio.h>
+#include <stdlib.h>
 
 char field[23][29];