diff --git a/src/input/mpegts/linuxdvb/linuxdvb_lnb.c b/src/input/mpegts/linuxdvb/linuxdvb_lnb.c
index 9e3b2e94..76bc4e94 100644
--- a/src/input/mpegts/linuxdvb/linuxdvb_lnb.c
+++ b/src/input/mpegts/linuxdvb/linuxdvb_lnb.c
@@ -97,12 +97,12 @@ linuxdvb_lnb_standard_freq
   ( linuxdvb_lnb_t *l, linuxdvb_mux_t *lm )
 {
   linuxdvb_lnb_conf_t *lnb = (linuxdvb_lnb_conf_t*)l;
-  uint32_t               f = lm->lm_tuning.dmc_fe_params.frequency;
+  int32_t                f = (int32_t)lm->lm_tuning.dmc_fe_params.frequency;
   if (lnb->lnb_switch && f > lnb->lnb_switch)
     f -= lnb->lnb_high;
   else
     f -= lnb->lnb_low;
-  return f;
+  return (uint32_t)abs(f);
 }
 
 static int
@@ -137,7 +137,7 @@ linuxdvb_lnb_bandstack_freq
   ( linuxdvb_lnb_t *l, linuxdvb_mux_t *lm )
 {
   linuxdvb_lnb_conf_t *lnb = (linuxdvb_lnb_conf_t*)l;
-  uint32_t               f = lm->lm_tuning.dmc_fe_params.frequency;
+  int32_t                f = (int32_t)lm->lm_tuning.dmc_fe_params.frequency;
   dvb_mux_conf_t      *dmc = &lm->lm_tuning;
   int pol = dmc->dmc_fe_polarisation == POLARISATION_HORIZONTAL ||
             dmc->dmc_fe_polarisation == POLARISATION_CIRCULAR_LEFT;
@@ -145,7 +145,7 @@ linuxdvb_lnb_bandstack_freq
     f -= lnb->lnb_high;
   else
     f -= lnb->lnb_low;
-  return f;
+  return (uint32_t)abs(f);
 }
 
 static int