diff --git a/scripts/kconfig/gconf.c b/scripts/kconfig/gconf.c
index e36b342f1065b750b4e0f9105a015c66bb38d94f..5527482c30779b2e8ecf96a127fcce4e81d8ebeb 100644
--- a/scripts/kconfig/gconf.c
+++ b/scripts/kconfig/gconf.c
@@ -18,6 +18,7 @@
 
 #include <stdio.h>
 #include <string.h>
+#include <strings.h>
 #include <unistd.h>
 #include <time.h>
 
diff --git a/scripts/kconfig/mconf.c b/scripts/kconfig/mconf.c
index 49c26ea9dd984db18f0709cb9a9eb95e47113dba..4063dbc1b9270279c391bc76d178bf76b745f3ca 100644
--- a/scripts/kconfig/mconf.c
+++ b/scripts/kconfig/mconf.c
@@ -15,6 +15,7 @@
 #include <stdarg.h>
 #include <stdlib.h>
 #include <string.h>
+#include <strings.h>
 #include <signal.h>
 #include <unistd.h>
 
diff --git a/scripts/kconfig/nconf.c b/scripts/kconfig/nconf.c
index b7c1ef757178ad21b0b622a0139d716e72f6f332..daf1c1506ec4cc95fece4e87f0bd799b4b9c7bef 100644
--- a/scripts/kconfig/nconf.c
+++ b/scripts/kconfig/nconf.c
@@ -8,6 +8,7 @@
 #define _GNU_SOURCE
 #endif
 #include <string.h>
+#include <strings.h>
 #include <stdlib.h>
 
 #include "lkc.h"