diff --git a/src/add-ons/kernel/drivers/tty/master.cpp b/src/add-ons/kernel/drivers/tty/master.cpp
index 86e987a62b..2b0941fd86 100644
--- a/src/add-ons/kernel/drivers/tty/master.cpp
+++ b/src/add-ons/kernel/drivers/tty/master.cpp
@@ -7,6 +7,7 @@
 #include "tty_private.h"
 
 #include <stdlib.h>
+#include <string.h>
 #include <util/AutoLock.h>
 
 
diff --git a/src/add-ons/kernel/drivers/tty/slave.cpp b/src/add-ons/kernel/drivers/tty/slave.cpp
index 8dfd3328c9..ab00a99c7f 100644
--- a/src/add-ons/kernel/drivers/tty/slave.cpp
+++ b/src/add-ons/kernel/drivers/tty/slave.cpp
@@ -5,6 +5,7 @@
 
 
 #include <stdlib.h>
+#include <string.h>
 
 #include <util/AutoLock.h>
 
diff --git a/src/add-ons/kernel/file_systems/ext2/Volume.cpp b/src/add-ons/kernel/file_systems/ext2/Volume.cpp
index f715d8f24c..66d50ae70f 100644
--- a/src/add-ons/kernel/file_systems/ext2/Volume.cpp
+++ b/src/add-ons/kernel/file_systems/ext2/Volume.cpp
@@ -12,6 +12,7 @@
 #include <new>
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 
 #include <fs_cache.h>
 #include <fs_volume.h>