diff --git a/core/fxcrt/timerhandler_iface.h b/core/fxcrt/timerhandler_iface.h
index 05f241e..04e781d 100644
--- a/core/fxcrt/timerhandler_iface.h
+++ b/core/fxcrt/timerhandler_iface.h
@@ -19,7 +19,7 @@
   virtual ~TimerHandlerIface() = default;
 
   virtual int32_t SetTimer(int32_t uElapse, TimerCallback lpTimerFunc) = 0;
-  virtual void KillTimer(int32_t nID) = 0;
+  virtual void KillTimer(int32_t nTimerID) = 0;
 };
 
 }  // namespace fxcrt
diff --git a/fpdfsdk/cpdfsdk_formfillenvironment.h b/fpdfsdk/cpdfsdk_formfillenvironment.h
index abafcef..130e208 100644
--- a/fpdfsdk/cpdfsdk_formfillenvironment.h
+++ b/fpdfsdk/cpdfsdk_formfillenvironment.h
@@ -51,7 +51,7 @@
 
   // TimerHandlerIface:
   int32_t SetTimer(int32_t uElapse, TimerCallback lpTimerFunc) override;
-  void KillTimer(int32_t nID) override;
+  void KillTimer(int32_t nTimerID) override;
 
   // IPWL_SystemHandler:
   void InvalidateRect(PerWindowData* pWidgetData,