diff --git a/CHANGELOG b/CHANGELOG
index 6493dea4..da494e4b 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -80,6 +80,9 @@ HISTORY
 
  ++ Bugfixes:
 
+  2013-01-15: Simon Goldschmidt
+  * pbuf.h: fixed bug #38097 pbuf_free_ooseq() warning
+ 
   2013-01-14: Simon Goldschmidt
   * dns.c: fixed bug #37705 Possible memory corruption in DNS query
  
diff --git a/src/include/lwip/pbuf.h b/src/include/lwip/pbuf.h
index 786b288b..4f8dca8a 100644
--- a/src/include/lwip/pbuf.h
+++ b/src/include/lwip/pbuf.h
@@ -136,7 +136,7 @@ struct pbuf_custom {
 #endif /* PBUF_POOL_FREE_OOSEQ */
 #if NO_SYS && PBUF_POOL_FREE_OOSEQ
 extern volatile u8_t pbuf_free_ooseq_pending;
-void pbuf_free_ooseq();
+void pbuf_free_ooseq(void);
 /** When not using sys_check_timeouts(), call PBUF_CHECK_FREE_OOSEQ()
     at regular intervals from main level to check if ooseq pbufs need to be
     freed! */