diff --git a/lib/fsk4hf/ft8b.f90 b/lib/fsk4hf/ft8b.f90
index 3c39909b6..f40913ba5 100644
--- a/lib/fsk4hf/ft8b.f90
+++ b/lib/fsk4hf/ft8b.f90
@@ -150,7 +150,7 @@ subroutine ft8b(dd0,newdat,nfqso,ndepth,icand,sync0,f1,xdt,apsym,nharderrors,
     call bpdecode174(llrap,apmask,max_iterations,decoded,cw,nharderrors)
     call timer('bpd174  ',1)
     dmin=0.0
-    if(nharderrors.lt.0) then
+    if(nharderrors.lt.0 .and. ndepth.ge.2) then
       call timer('osd174  ',0)
       call osd174(llr,norder,decoded,cw,nharderrors,dmin)
       call timer('osd174  ',1)