diff --git a/example-cdc-gnu-linux/usb-cdc.c b/example-cdc-gnu-linux/usb-cdc.c
index aa4c01d..f223127 100644
--- a/example-cdc-gnu-linux/usb-cdc.c
+++ b/example-cdc-gnu-linux/usb-cdc.c
@@ -669,9 +669,7 @@ tty_main (void *arg)
       if (usb_intr.ready)
 	{
 	  uint8_t ep_num;
-#if defined(OLDER_SYS_H)
-	event_handle:
-#endif
+
 	  /*
 	   * When interrupt is detected, call usb_lld_event_handler.
 	   * The event may be one of following:
diff --git a/example-cdc/usb-cdc.c b/example-cdc/usb-cdc.c
index 64c5ac4..5d46e83 100644
--- a/example-cdc/usb-cdc.c
+++ b/example-cdc/usb-cdc.c
@@ -672,24 +672,8 @@ tty_main (void *arg)
   struct usb_dev dev;
   int e;
 
-#if defined(OLDER_SYS_H)
-  /*
-   * Historically (before sys < 3.0), NVIC priority setting for USB
-   * interrupt was done in usb_lld_sys_init for free standing
-   * application.  Thus this compatibility code.
-   *
-   * We can't call usb_lld_init after chopstx_claim_irq, as
-   * usb_lld_init does its own setting for NVIC, which is incompatible
-   * to Chopstx's interrupt handling.  Calling chopstx_claim_irq after
-   * usb_lld_init overrides that for Chopstx.
-   *
-   */
-  usb_lld_init (&dev, VCOM_FEATURE_BUS_POWERED);
-  chopstx_claim_irq (&usb_intr, INTR_REQ_USB);
-#else
   chopstx_claim_irq (&usb_intr, INTR_REQ_USB);
   usb_lld_init (&dev, VCOM_FEATURE_BUS_POWERED);
-#endif
 
   while (1)
     {
@@ -697,9 +681,7 @@ tty_main (void *arg)
       if (usb_intr.ready)
 	{
 	  uint8_t ep_num;
-#if defined(OLDER_SYS_H)
-	event_handle:
-#endif
+
 	  /*
 	   * When interrupt is detected, call usb_lld_event_handler.
 	   * The event may be one of following:
diff --git a/example-fraucheky/main.c b/example-fraucheky/main.c
index 34b4a01..b93b29e 100644
--- a/example-fraucheky/main.c
+++ b/example-fraucheky/main.c
@@ -173,7 +173,6 @@ usb_main (void *arg)
   (void)arg;
   chopstx_claim_irq (&interrupt, INTR_REQ_USB);
   usb_lld_init (&dev, FEATURE_BUS_POWERED);
-  goto event_handle;	/* For old SYS < 3.0 */
 
   while (1)
     {
@@ -183,7 +182,6 @@ usb_main (void *arg)
 	{
 	  uint8_t ep_num;
 
-	event_handle:
 	  e = usb_lld_event_handler (&dev);
 	  chopstx_intr_done (&interrupt);
 	  ep_num = USB_EVENT_ENDP (e);
diff --git a/example-fs-bb48/usb-cdc.c b/example-fs-bb48/usb-cdc.c
index 1e44124..8e13411 100644
--- a/example-fs-bb48/usb-cdc.c
+++ b/example-fs-bb48/usb-cdc.c
@@ -657,24 +657,8 @@ tty_main (void *arg)
   struct usb_dev dev;
   int e;
 
-#if defined(OLDER_SYS_H)
-  /*
-   * Historically (before sys < 3.0), NVIC priority setting for USB
-   * interrupt was done in usb_lld_sys_init for free standing
-   * application.  Thus this compatibility code.
-   *
-   * We can't call usb_lld_init after chopstx_claim_irq, as
-   * usb_lld_init does its own setting for NVIC, which is incompatible
-   * to Chopstx's interrupt handling.  Calling chopstx_claim_irq after
-   * usb_lld_init overrides that for Chopstx.
-   *
-   */
-  usb_lld_init (&dev, VCOM_FEATURE_BUS_POWERED);
-  chopstx_claim_irq (&usb_intr, INTR_REQ_USB);
-#else
   chopstx_claim_irq (&usb_intr, INTR_REQ_USB);
   usb_lld_init (&dev, VCOM_FEATURE_BUS_POWERED);
-#endif
 
   while (1)
     {
@@ -685,9 +669,7 @@ tty_main (void *arg)
       if (usb_intr.ready)
 	{
 	  uint8_t ep_num;
-#if defined(OLDER_SYS_H)
-	event_handle:
-#endif
+
 	  /*
 	   * When interrupt is detected, call usb_lld_event_handler.
 	   * The event may be one of following:
diff --git a/example-usb-serial/usb-cdc.c b/example-usb-serial/usb-cdc.c
index 8e0adfa..bafe71c 100644
--- a/example-usb-serial/usb-cdc.c
+++ b/example-usb-serial/usb-cdc.c
@@ -722,24 +722,8 @@ cdc_main (void *arg)
 
   (void)arg;
 
-#if defined(OLDER_SYS_H)
-  /*
-   * Historically (before sys < 3.0), NVIC priority setting for USB
-   * interrupt was done in usb_lld_sys_init for free standing
-   * application.  Thus this compatibility code.
-   *
-   * We can't call usb_lld_init after chopstx_claim_irq, as
-   * usb_lld_init does its own setting for NVIC, which is incompatible
-   * to Chopstx's interrupt handling.  Calling chopstx_claim_irq after
-   * usb_lld_init overrides that for Chopstx.
-   *
-   */
-  usb_lld_init (&dev, VCOM_FEATURE_BUS_POWERED);
-  chopstx_claim_irq (&usb_intr, INTR_REQ_USB);
-#else
   chopstx_claim_irq (&usb_intr, INTR_REQ_USB);
   usb_lld_init (&dev, VCOM_FEATURE_BUS_POWERED);
-#endif
 
   while (1)
     {
@@ -747,9 +731,7 @@ cdc_main (void *arg)
       if (usb_intr.ready)
 	{
 	  uint8_t ep_num;
-#if defined(OLDER_SYS_H)
-	event_handle:
-#endif
+
 	  /*
 	   * When interrupt is detected, call usb_lld_event_handler.
 	   * The event may be one of following: