diff --git a/drivers/staging/pi433/rf69.c b/drivers/staging/pi433/rf69.c
index 70827034f5d0..1ae23764b911 100644
--- a/drivers/staging/pi433/rf69.c
+++ b/drivers/staging/pi433/rf69.c
@@ -117,7 +117,7 @@ enum modulation rf69_get_modulation(struct spi_device *spi)
 	switch (currentValue & MASK_DATAMODUL_MODULATION_TYPE >> 3) { // TODO improvement: change 3 to define
 	case DATAMODUL_MODULATION_TYPE_OOK: return OOK;
 	case DATAMODUL_MODULATION_TYPE_FSK: return FSK;
-	default:			    return undefined;
+	default:			    return UNDEF;
 	}
 }
 
diff --git a/drivers/staging/pi433/rf69_enum.h b/drivers/staging/pi433/rf69_enum.h
index 4e64e38ae4ff..ec91f329d871 100644
--- a/drivers/staging/pi433/rf69_enum.h
+++ b/drivers/staging/pi433/rf69_enum.h
@@ -28,7 +28,8 @@ enum mode {
 
 enum modulation {
 	OOK,
-	FSK
+	FSK,
+	UNDEF
 };
 
 enum mod_shaping {