diff --git a/net/tcp/tcp_wrbuffer.c b/net/tcp/tcp_wrbuffer.c
index 686f025503..1ff8cf519b 100644
--- a/net/tcp/tcp_wrbuffer.c
+++ b/net/tcp/tcp_wrbuffer.c
@@ -73,10 +73,7 @@ struct wrbuffer_s
 
 /* This is the state of the global write buffer resource */
 
-static struct wrbuffer_s g_wrbuffer =
-{
-  SEM_INITIALIZER(CONFIG_NET_TCP_NWRBCHAINS),
-};
+static struct wrbuffer_s g_wrbuffer;
 
 /****************************************************************************
  * Public Functions
@@ -97,6 +94,10 @@ void tcp_wrbuffer_initialize(void)
 {
   int i;
 
+  sq_init(&g_wrbuffer.freebuffers);
+
+  nxsem_init(&g_wrbuffer.sem, 0, CONFIG_NET_TCP_NWRBCHAINS);
+
   for (i = 0; i < CONFIG_NET_TCP_NWRBCHAINS; i++)
     {
       sq_addfirst(&g_wrbuffer.buffers[i].wb_node, &g_wrbuffer.freebuffers);
diff --git a/net/udp/udp_wrbuffer.c b/net/udp/udp_wrbuffer.c
index f6a0fd9324..3ae627a774 100644
--- a/net/udp/udp_wrbuffer.c
+++ b/net/udp/udp_wrbuffer.c
@@ -72,10 +72,7 @@ struct wrbuffer_s
 
 /* This is the state of the global write buffer resource */
 
-static struct wrbuffer_s g_wrbuffer =
-{
-  SEM_INITIALIZER(CONFIG_NET_UDP_NWRBCHAINS)
-};
+static struct wrbuffer_s g_wrbuffer;
 
 /****************************************************************************
  * Public Functions
@@ -98,6 +95,8 @@ void udp_wrbuffer_initialize(void)
 
   sq_init(&g_wrbuffer.freebuffers);
 
+  nxsem_init(&g_wrbuffer.sem, 0, CONFIG_NET_UDP_NWRBCHAINS);
+
   for (i = 0; i < CONFIG_NET_UDP_NWRBCHAINS; i++)
     {
       sq_addfirst(&g_wrbuffer.buffers[i].wb_node, &g_wrbuffer.freebuffers);