diff --git a/CHANGELOG b/CHANGELOG
index 404798ca..18e33041 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -80,6 +80,10 @@ HISTORY
 
  ++ Bugfixes:
 
+  2012-05-03: Simon Goldschmidt (patch by )
+  * ppp.c: fixed bug #36283 (PPP struct used on header size computation and
+    not packed)
+
   2012-05-03: Simon Goldschmidt (patch by David Empson)
   * ppp.c: fixed bug #36388 (PPP: checksum-only in last pbuf leads to pbuf with
     zero length)
diff --git a/src/netif/ppp/ppp.c b/src/netif/ppp/ppp.c
index d880310e..2a346575 100644
--- a/src/netif/ppp/ppp.c
+++ b/src/netif/ppp/ppp.c
@@ -1586,10 +1586,21 @@ pppSingleBuf(struct pbuf *p)
   return q;
 }
 
+/** Input helper struct, must be packed since it is stored to pbuf->payload,
+ * which might be unaligned.
+ */
+#ifdef PACK_STRUCT_USE_INCLUDES
+#  include "arch/bpstruct.h"
+#endif
+PACK_STRUCT_BEGIN
 struct pppInputHeader {
-  int unit;
-  u16_t proto;
-};
+  PACK_STRUCT_FIELD(int unit);
+  PACK_STRUCT_FIELD(u16_t proto);
+} PACK_STRUCT_STRUCT;
+PACK_STRUCT_END
+#ifdef PACK_STRUCT_USE_INCLUDES
+#  include "arch/epstruct.h"
+#endif
 
 /*
  * Pass the processed input packet to the appropriate handler.