diff --git a/drivers/staging/speakup/speakup_dtlk.c b/drivers/staging/speakup/speakup_dtlk.c
index a965378a767e..1feb0fba1b43 100644
--- a/drivers/staging/speakup/speakup_dtlk.c
+++ b/drivers/staging/speakup/speakup_dtlk.c
@@ -254,7 +254,7 @@ static const char *synth_immediate(struct spk_synth *synth, const char *buf)
 		spk_out(ch);
 		buf++;
 	}
-	return 0;
+	return NULL;
 }
 
 static void synth_flush(struct spk_synth *synth)