diff --git a/sensors/ov2640.c b/sensors/ov2640.c
index 3ef91b2..e1a5b57 100755
--- a/sensors/ov2640.c
+++ b/sensors/ov2640.c
@@ -414,8 +414,10 @@ static int set_hmirror_sensor(sensor_t *sensor, int enable)
 
 static int set_vflip_sensor(sensor_t *sensor, int enable)
 {
+    int ret = 0;
     sensor->status.vflip = enable;
-    return write_reg_bits(sensor, BANK_SENSOR, REG04, REG04_VFLIP_IMG, enable?1:0);
+    ret = write_reg_bits(sensor, BANK_SENSOR, REG04, REG04_VREF_EN, enable?1:0);
+    return ret & write_reg_bits(sensor, BANK_SENSOR, REG04, REG04_VFLIP_IMG, enable?1:0);
 }
 
 static int set_raw_gma_dsp(sensor_t *sensor, int enable)