--- vdr-2.2.0/dvbdevice.c	2018-07-24 00:05:36.531905776 +0200
+++ vdr-2.2.0/dvbdevice.c	2018-07-24 00:04:53.472525371 +0200
@@ -845,7 +845,7 @@
         CHECK(ioctl(fd_frontend, FE_SET_VOLTAGE, volt));
         CHECK(ioctl(fd_frontend, FE_SET_TONE, tone));
         }
-     frequency = abs(frequency); // Allow for C-band, where the frequency is less than the LOF
+     frequency = abs((int) frequency); // Allow for C-band, where the frequency is less than the LOF
 
      // DVB-S/DVB-S2 (common parts)
      SETCMD(DTV_FREQUENCY, frequency * 1000UL);