diff --git a/arch/arm/src/phy62xx/phy6222_patch.c b/arch/arm/src/phy62xx/phy6222_patch.c
index bafa96fe84..6e60ce118a 100644
--- a/arch/arm/src/phy62xx/phy6222_patch.c
+++ b/arch/arm/src/phy62xx/phy6222_patch.c
@@ -1,19 +1,24 @@
-#include "types.h"
-#include <arch/irq.h>
-#include "mcu_phy_bumbee.h"
-
-#ifndef CONFIG_PHY6222_SDK
-void TIM1_IRQHandler1(void)
-{
-  /*  HAL_ENTER_CRITICAL_SECTION() */
-
-  if (AP_TIM1->status & 0x1)
-    {
-      clear_timer_int(AP_TIM1);
-      clear_timer(AP_TIM1);
-      LL_evt_schedule();
-    }
-
-  /* HAL_EXIT_CRITICAL_SECTION(); */
-}
-#endif
+#include "types.h"
+#include "rom_sym_def.h"
+#include <arch/irq.h>
+#include "mcu_phy_bumbee.h"
+
+extern int clear_timer_int(AP_TIM_TypeDef* TIMx);
+extern void clear_timer(AP_TIM_TypeDef* TIMx);
+extern void LL_evt_schedule(void);
+
+#ifndef CONFIG_PHY6222_SDK
+void TIM1_IRQHandler1(void)
+{
+  /*  HAL_ENTER_CRITICAL_SECTION() */
+
+  if (AP_TIM1->status & 0x1)
+    {
+      clear_timer_int(AP_TIM1);
+      clear_timer(AP_TIM1);
+      LL_evt_schedule();
+    }
+
+  /* HAL_EXIT_CRITICAL_SECTION(); */
+}
+#endif