diff --git a/CHANGELOG b/CHANGELOG
index c8feecfc..6b2b3e3b 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -19,6 +19,9 @@ HISTORY
 
   ++ New features:
 
+  2009-04-27 Simon Goldschmidt
+  * sys.h: Made SYS_LIGHTWEIGHT_PROT and sys_now() work with NO_SYS=1
+
   2009-04-25 Simon Goldschmidt
   * mem.c, opt.h: Added option MEM_USE_POOLS_TRY_BIGGER_POOL to try the next
     bigger malloc pool if one is empty (only usable with MEM_USE_POOLS).
diff --git a/src/include/lwip/sys.h b/src/include/lwip/sys.h
index 7f0ee891..0cc84ddf 100644
--- a/src/include/lwip/sys.h
+++ b/src/include/lwip/sys.h
@@ -44,7 +44,6 @@ extern "C" {
    definitions of the sys_ functions. */
 typedef u8_t sys_sem_t;
 typedef u8_t sys_mbox_t;
-typedef u8_t sys_prot_t;
 struct sys_timeo {u8_t dummy;};
 
 #define sys_init()
@@ -139,11 +138,11 @@ void sys_mbox_fetch(sys_mbox_t mbox, void **msg);
 /* Thread functions. */
 sys_thread_t sys_thread_new(char *name, void (* thread)(void *arg), void *arg, int stacksize, int prio);
 
-/* Returns the current time in microseconds. */
-u32_t sys_now(void);
-
 #endif /* NO_SYS */
 
+/** Returns the current time in milliseconds. */
+u32_t sys_now(void);
+
 /* Critical Region Protection */
 /* These functions must be implemented in the sys_arch.c file.
    In some implementations they can provide a more light-weight protection