diff --git a/include/common.h b/include/common.h
index 6a79ec2..2f85d12 100644
--- a/include/common.h
+++ b/include/common.h
@@ -631,6 +631,10 @@
 	return (string_to_ip(getenv(var)));
 }
 
+/* lib/qsort.c */
+void qsort(void *base, size_t nmemb, size_t size,
+	   int(*compar)(const void *, const void *));
+
 /* lib/time.c */
 void	udelay        (unsigned long);