diff --git a/lib/sw_apps/lwip_echo_server/src/main.c b/lib/sw_apps/lwip_echo_server/src/main.c
index db1ad49a..7b0e8a39 100755
--- a/lib/sw_apps/lwip_echo_server/src/main.c
+++ b/lib/sw_apps/lwip_echo_server/src/main.c
@@ -42,6 +42,8 @@
 #include "xil_printf.h"
 #endif
 
+#include "lwip/tcp.h"
+
 #if LWIP_DHCP==1
 #include "lwip/dhcp.h"
 #endif
@@ -59,6 +61,8 @@ extern volatile int dhcp_timoutcntr;
 err_t dhcp_start(struct netif *netif);
 #endif
 
+extern volatile int TcpFastTmrFlag;
+extern volatile int TcpSlowTmrFlag;
 static struct netif server_netif;
 struct netif *echo_netif;
 
@@ -165,6 +169,14 @@ int main()
 
 	/* receive and process packets */
 	while (1) {
+		if (TcpFastTmrFlag) {
+			tcp_fasttmr();
+			TcpFastTmrFlag = 0;
+		}
+		if (TcpSlowTmrFlag) {
+			tcp_slowtmr();
+			TcpSlowTmrFlag = 0;
+		}
 		xemacif_input(echo_netif);
 		transfer_data();
 	}
diff --git a/lib/sw_apps/lwip_echo_server/src/platform.c b/lib/sw_apps/lwip_echo_server/src/platform.c
index 1dbe49da..2026c535 100755
--- a/lib/sw_apps/lwip_echo_server/src/platform.c
+++ b/lib/sw_apps/lwip_echo_server/src/platform.c
@@ -37,6 +37,7 @@
 #include "xparameters.h"
 #include "xintc.h"
 #include "xil_exception.h"
+#include "lwip/tcp.h"
 #ifdef STDOUT_IS_16550
 #include "xuartns550_l.h"
 #endif
@@ -49,6 +50,9 @@ void dhcp_fine_tmr();
 void dhcp_coarse_tmr();
 #endif
 
+volatile int TcpFastTmrFlag = 0;
+volatile int TcpSlowTmrFlag = 0;
+
 void
 timer_callback()
 {
@@ -59,7 +63,7 @@ timer_callback()
 #if LWIP_DHCP==1
     static int dhcp_timer = 0;
 #endif
-	tcp_fasttmr();
+	 TcpFastTmrFlag = 1;
 
 	odd = !odd;
 	if (odd) {
@@ -68,8 +72,7 @@ timer_callback()
 		dhcp_timer++;
 		dhcp_timoutcntr--;
 #endif
-		tcp_slowtmr();
-
+		TcpSlowTmrFlag = 1;
 #if LWIP_DHCP==1
 		dhcp_fine_tmr();
 		if (dhcp_timer >= 120) {
diff --git a/lib/sw_apps/lwip_echo_server/src/platform_zynq.c b/lib/sw_apps/lwip_echo_server/src/platform_zynq.c
index 011a69e6..e4df659f 100755
--- a/lib/sw_apps/lwip_echo_server/src/platform_zynq.c
+++ b/lib/sw_apps/lwip_echo_server/src/platform_zynq.c
@@ -79,6 +79,9 @@ static int ResetRxCntr = 0;
 extern struct netif *echo_netif;
 #endif
 
+volatile int TcpFastTmrFlag = 0;
+volatile int TcpSlowTmrFlag = 0;
+
 #if LWIP_DHCP==1
 volatile int dhcp_timoutcntr = 24;
 void dhcp_fine_tmr();
@@ -95,18 +98,18 @@ timer_callback(XScuTimer * TimerInstance)
 #if LWIP_DHCP==1
     static int dhcp_timer = 0;
 #endif
+	 TcpFastTmrFlag = 1;
 
 	odd = !odd;
 #ifndef USE_SOFTETH_ON_ZYNQ
 	ResetRxCntr++;
 #endif
-	tcp_fasttmr();
 	if (odd) {
 #if LWIP_DHCP==1
 		dhcp_timer++;
 		dhcp_timoutcntr--;
 #endif
-		tcp_slowtmr();
+		TcpSlowTmrFlag = 1;
 #if LWIP_DHCP==1
 		dhcp_fine_tmr();
 		if (dhcp_timer >= 120) {