diff --git a/drivers/staging/speakup/speakup_decpc.c b/drivers/staging/speakup/speakup_decpc.c
index b50388fd4f0868d77e269d3eb409c1090702b676..ea6b72d40b317f9eb342b66c9a3c762b8f6f96cb 100644
--- a/drivers/staging/speakup/speakup_decpc.c
+++ b/drivers/staging/speakup/speakup_decpc.c
@@ -444,7 +444,7 @@ static const char *synth_immediate(struct spk_synth *synth, const char *buf)
 			return buf;
 		buf++;
 	}
-	return 0;
+	return NULL;
 }
 
 static int synth_probe(struct spk_synth *synth)