diff --git a/src/input/mpegts/mpegts_service.c b/src/input/mpegts/mpegts_service.c
index e2b06e39c8..4467b7be52 100644
--- a/src/input/mpegts/mpegts_service.c
+++ b/src/input/mpegts/mpegts_service.c
@@ -451,7 +451,8 @@ mpegts_service_channel_icon ( service_t *s )
       case DVB_TYPE_S:
         if ((pos = dvb_network_get_orbital_pos(mmd->mm_network)) == INT_MAX)
           return NULL;
-        hash = (pos >= 0 ? pos : 0xFFFF - abs(pos)) << 16;
+        assert(pos >= -1800 && pos <= 1800);
+        hash = (pos >= 0 ? pos : 3600 - pos) << 16;
         break;
       case DVB_TYPE_C:
         hash = 0xFFFF0000;