diff --git a/src/v4l.c b/src/v4l.c
index 1a48fed..ef3d451 100644
--- a/src/v4l.c
+++ b/src/v4l.c
@@ -173,7 +173,7 @@ static int
 v4l_service_start(service_t *t, unsigned int weight, int force_start)
 {
   v4l_adapter_t *va = t->s_v4l_adapter;
-  int frequency = t->s_v4l_frequency;
+  unsigned int frequency = t->s_v4l_frequency;
   struct v4l2_frequency vf;
   int result;
   v4l2_std_id std = 0xff;
@@ -204,7 +204,7 @@ v4l_service_start(service_t *t, unsigned int weight, int force_start)
 
     vf.tuner = 0;
     vf.type = V4L2_TUNER_ANALOG_TV;
-    vf.frequency = (frequency * 16) / 1000000;
+    vf.frequency = (frequency * 16) / 1000;
     result = ioctl(fd, VIDIOC_S_FREQUENCY, &vf);
     if(result < 0) {
       tvhlog(LOG_ERR, "v4l",