diff --git a/cores/arduino/HardwareTimer.cpp b/cores/arduino/HardwareTimer.cpp
index d26e8342b8..a7142630a5 100644
--- a/cores/arduino/HardwareTimer.cpp
+++ b/cores/arduino/HardwareTimer.cpp
@@ -1248,7 +1248,7 @@ timer_index_t get_timer_index(TIM_TypeDef *instance)
 #endif
 #if defined(TIM22_BASE)
   if (instance == TIM22) {
-    index = TIMER2_INDEX;
+    index = TIMER22_INDEX;
   }
 #endif
   return index;