diff --git a/CHANGELOG b/CHANGELOG
index ca913dd4..53a852c4 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -25,6 +25,9 @@ HISTORY
 
   ++ Bugfixes:
 
+  2009-08-23 Simon Goldschmidt
+  * many ppp files: bug #27267: Added include to string.h where needed
+
   2009-08-23 Simon Goldschmidt
   * tcp.h: patch #6843: tcp.h macro optimization patch (for little endian)
 
diff --git a/src/netif/ppp/auth.c b/src/netif/ppp/auth.c
index 4c0ee6a8..cbd3eb21 100644
--- a/src/netif/ppp/auth.c
+++ b/src/netif/ppp/auth.c
@@ -82,6 +82,8 @@
 #include "cbcp.h"
 #endif /* CBCP_SUPPORT */
 
+#include <string.h>
+
 /*************************/
 /*** LOCAL DEFINITIONS ***/
 /*************************/
diff --git a/src/netif/ppp/chap.c b/src/netif/ppp/chap.c
index 6d9c3c3c..b3ea6b22 100644
--- a/src/netif/ppp/chap.c
+++ b/src/netif/ppp/chap.c
@@ -82,6 +82,7 @@
 #include "chap.h"
 #include "chpms.h"
 
+#include <string.h>
 
 /*************************/
 /*** LOCAL DEFINITIONS ***/
diff --git a/src/netif/ppp/fsm.c b/src/netif/ppp/fsm.c
index c073f1e3..16f4b679 100644
--- a/src/netif/ppp/fsm.c
+++ b/src/netif/ppp/fsm.c
@@ -64,6 +64,8 @@
 
 #include "fsm.h"
 
+#include <string.h>
+
 
 /*************************/
 /*** LOCAL DEFINITIONS ***/
diff --git a/src/netif/ppp/md5.c b/src/netif/ppp/md5.c
index d65ecedb..7a60d783 100644
--- a/src/netif/ppp/md5.c
+++ b/src/netif/ppp/md5.c
@@ -42,6 +42,8 @@
 
 #include "md5.h"
 
+#include <string.h>
+
 /*
  ***********************************************************************
  **  Message-digest routines:                                         **
diff --git a/src/netif/ppp/pap.c b/src/netif/ppp/pap.c
index 7c3fd7e4..e4c804f5 100644
--- a/src/netif/ppp/pap.c
+++ b/src/netif/ppp/pap.c
@@ -61,6 +61,8 @@
 #include "auth.h"
 #include "pap.h"
 
+#include <string.h>
+
 /***********************************/
 /*** LOCAL FUNCTION DECLARATIONS ***/
 /***********************************/
diff --git a/src/netif/ppp/randm.c b/src/netif/ppp/randm.c
index 0c622a0b..83c41741 100644
--- a/src/netif/ppp/randm.c
+++ b/src/netif/ppp/randm.c
@@ -41,6 +41,7 @@
 #include "ppp.h"
 #include "pppdebug.h"
 
+#include <string.h>
 
 #if MD5_SUPPORT /* this module depends on MD5 */
 #define RANDPOOLSZ 16   /* Bytes stored in the pool of randomness. */