diff --git a/Demo/Common/ethernet/lwip-1.4.0/ports/MicroBlaze-Ethernet-Lite/sys_arch.c b/Demo/Common/ethernet/lwip-1.4.0/ports/MicroBlaze-Ethernet-Lite/sys_arch.c
index 8aecd5be3..c65e1f82b 100644
--- a/Demo/Common/ethernet/lwip-1.4.0/ports/MicroBlaze-Ethernet-Lite/sys_arch.c
+++ b/Demo/Common/ethernet/lwip-1.4.0/ports/MicroBlaze-Ethernet-Lite/sys_arch.c
@@ -391,7 +391,7 @@ err_t sys_mutex_new( sys_mutex_t *pxMutex )
 {
 err_t xReturn = ERR_MEM;
 
-	*pxMutex = xQueueCreateMutex();
+	*pxMutex = xSemaphoreCreateMutex();
 
 	if( *pxMutex != NULL ) 
 	{
diff --git a/Demo/Common/ethernet/lwip-1.4.0/ports/win32/sys_arch.c b/Demo/Common/ethernet/lwip-1.4.0/ports/win32/sys_arch.c
index bedf174a4..bf4080039 100644
--- a/Demo/Common/ethernet/lwip-1.4.0/ports/win32/sys_arch.c
+++ b/Demo/Common/ethernet/lwip-1.4.0/ports/win32/sys_arch.c
@@ -363,7 +363,7 @@ err_t sys_mutex_new( sys_mutex_t *pxMutex )
 {
 err_t xReturn = ERR_MEM;
 
-	*pxMutex = xQueueCreateMutex();
+	*pxMutex = xSemaphoreCreateMutex();
 
 	if( *pxMutex != NULL ) 
 	{