diff --git a/cpukit/ChangeLog b/cpukit/ChangeLog
index 66078f12c4..d6860fe75a 100644
--- a/cpukit/ChangeLog
+++ b/cpukit/ChangeLog
@@ -1,5 +1,7 @@
 2010-04-14	Ralf Corsépius <ralf.corsepius@rtems.org>
 
+	* libnetworking/sys/mbuf.h: Use uintptr_t instead of u_long
+	for 16bit target compliance.
 	* libnetworking/libc/gethostbydns.c: Use uintptr_t instead of u_long
 	for 16bit target compliance.
 	* libnetworking/sys/sysctl.h: Change sysctl_oid->arg2 into int32_t
diff --git a/cpukit/libnetworking/sys/mbuf.h b/cpukit/libnetworking/sys/mbuf.h
index 450787573c..bad425e4ae 100644
--- a/cpukit/libnetworking/sys/mbuf.h
+++ b/cpukit/libnetworking/sys/mbuf.h
@@ -63,7 +63,7 @@
  */
 #define	mtod(m, t)	((t)((m)->m_data))
 #define	dtom(x)		((struct mbuf *)((intptr_t)(x) & ~(MSIZE-1)))
-#define	mtocl(x)	(((u_long)(x) - (u_long)mbutl) >> MCLSHIFT)
+#define	mtocl(x)	(((uintptr_t)(x) - (uintptr_t)mbutl) >> MCLSHIFT)
 #define	cltom(x)	((caddr_t)((u_long)mbutl + ((u_long)(x) << MCLSHIFT)))
 
 /*