diff --git a/watch-library/hardware/watch/watch_tcc.c b/watch-library/hardware/watch/watch_tcc.c
index 39554f80..efee7a98 100644
--- a/watch-library/hardware/watch/watch_tcc.c
+++ b/watch-library/hardware/watch/watch_tcc.c
@@ -132,8 +132,8 @@ void watch_buzzer_abort_sequence(void) {
     _tcc_write_RUNSTDBY(false);
 }
 
-void TC3_Handler(void) {
-    // interrupt handler vor TC3 (globally!)
+void irq_handler_tc3(void) {
+    // interrupt handler for TC3 (globally!)
     cb_watch_buzzer_seq();
     TC3->COUNT8.INTFLAG.reg |= TC_INTFLAG_OVF;
 }
diff --git a/watch-library/shared/watch/watch_tcc.h b/watch-library/shared/watch/watch_tcc.h
index c70260e4..6f965b66 100644
--- a/watch-library/shared/watch/watch_tcc.h
+++ b/watch-library/shared/watch/watch_tcc.h
@@ -188,7 +188,7 @@ void watch_buzzer_play_sequence(int8_t *note_sequence, void (*callback_on_end)(v
 void watch_buzzer_abort_sequence(void);
 
 #ifndef __EMSCRIPTEN__
-void TC3_Handler(void);
+void irq_handler_tc3(void);
 #endif
 
 /** @addtogroup led LED Control