diff --git a/armsrc/em4x50.h b/armsrc/em4x50.h
index c483bf27f..7e4c00fba 100644
--- a/armsrc/em4x50.h
+++ b/armsrc/em4x50.h
@@ -18,8 +18,8 @@ typedef struct {
 } em4x50_tag_t;
 
 int em4x50_standalone_read(uint64_t *words);
-bool em4x50_sim_send_listen_window2(void);
-bool em4x50_sim_send_word3(uint32_t word);
+bool em4x50_sim_send_listen_window(void);
+bool em4x50_sim_send_word(uint32_t word);
 
 void em4x50_info(em4x50_data_t *etd);
 void em4x50_write(em4x50_data_t *etd);