diff --git a/src/host/layer23/include/osmocom/bb/mobile/voice.h b/src/host/layer23/include/osmocom/bb/mobile/voice.h
index a05241835..b9817f8a9 100644
--- a/src/host/layer23/include/osmocom/bb/mobile/voice.h
+++ b/src/host/layer23/include/osmocom/bb/mobile/voice.h
@@ -1,7 +1,4 @@
-#ifndef _voice_h
-#define _voice_h
+#pragma once
 
 int gsm_voice_init(struct osmocom_ms *ms);
 int gsm_send_voice(struct osmocom_ms *ms, struct gsm_data_frame *data);
-
-#endif /* _voice_h */