diff --git a/CHANGELOG b/CHANGELOG
index 072ff5b8..61f07be0 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -49,6 +49,9 @@ HISTORY
 
  ++ Bugfixes:
 
+  2011-10-13: Simon Goldschmidt
+  * def.h, timers.c: fixed bug #34541: LWIP_U32_DIFF is unnecessarily complex
+
   2011-10-13: Simon Goldschmidt
   * sockets.c, api_lib.c: fixed bug #34540: compiler error when CORE_LOCKING is
     used and not all protocols are enabled
diff --git a/src/core/timers.c b/src/core/timers.c
index 8af1b017..e3084666 100644
--- a/src/core/timers.c
+++ b/src/core/timers.c
@@ -367,7 +367,7 @@ sys_check_timeouts(void)
 
     now = sys_now();
     /* this cares for wraparounds */
-    diff = LWIP_U32_DIFF(now, timeouts_last_time);
+    diff = now - timeouts_last_time;
     do
     {
 #if PBUF_POOL_FREE_OOSEQ
diff --git a/src/include/lwip/def.h b/src/include/lwip/def.h
index 9b6de6a8..73a1b560 100644
--- a/src/include/lwip/def.h
+++ b/src/include/lwip/def.h
@@ -47,10 +47,6 @@ extern "C" {
 #define NULL ((void *)0)
 #endif
 
-/** Get the absolute difference between 2 u32_t values (correcting overflows)
- * 'a' is expected to be 'higher' (without overflow) than 'b'. */
-#define LWIP_U32_DIFF(a, b) (((a) >= (b)) ? ((a) - (b)) : (((a) + ((b) ^ 0xFFFFFFFF) + 1))) 
-
 /* Endianess-optimized shifting of two u8_t to create one u16_t */
 #if BYTE_ORDER == LITTLE_ENDIAN
 #define LWIP_MAKE_U16(a, b) ((a << 8) | b)