diff --git a/C_Language/cronbis.c b/C_Language/cronbis.c
index 28f7a8e..d04a31f 100644
--- a/C_Language/cronbis.c
+++ b/C_Language/cronbis.c
@@ -1,3 +1,4 @@
+#include <sys/wait.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>