diff --git a/src/arch/unix/include/arch/lib.h b/src/arch/unix/include/arch/lib.h
index f739dea5..fe2ccb11 100644
--- a/src/arch/unix/include/arch/lib.h
+++ b/src/arch/unix/include/arch/lib.h
@@ -31,6 +31,7 @@
  */
 #ifndef __ARCH_LIB_H__
 #define __ARCH_LIB_H__
+#include <string.h>
 
 #ifndef _STRING_H_
 #ifndef _STRING_H