diff --git a/src/dvb/dvb_adapter.c b/src/dvb/dvb_adapter.c
index 8b3878d..72754a5 100644
--- a/src/dvb/dvb_adapter.c
+++ b/src/dvb/dvb_adapter.c
@@ -1022,7 +1022,7 @@ dvb_adapter_input_dvr(void *aux)
     dmx_param.pes_type = DMX_PES_OTHER;
     dmx_param.flags = DMX_IMMEDIATE_START;

-    if(ioctl(dmx, DMX_SET_PES_FILTER, &dmx_param)) {
+    if(ioctl(dmx, DMX_SET_PES_FILTER, &dmx_param) == -1) {
       tvhlog(LOG_ERR, "dvb",
             "Unable to configure demuxer \"%s\" for all PIDs -- %s",
             tda->tda_demux_path, strerror(errno));
diff --git a/src/dvb/dvb_input_filtered.c b/src/dvb/dvb_input_filtered.c
index a4dddf2..6a124a5 100644
--- a/src/dvb/dvb_input_filtered.c
+++ b/src/dvb/dvb_input_filtered.c
@@ -71,7 +71,7 @@ open_service(th_dvb_adapter_t *tda, service_t *s)
     dmx_param.pes_type = DMX_PES_OTHER;
     dmx_param.flags = DMX_IMMEDIATE_START;

-    if(ioctl(fd, DMX_SET_PES_FILTER, &dmx_param)) {
+    if(ioctl(fd, DMX_SET_PES_FILTER, &dmx_param) == -1) {
       tvhlog(LOG_ERR, "dvb",
             "\"%s\" unable to configure demuxer \"%s\" for pid %d -- %s",
             s->s_identifier, tda->tda_demux_path,