diff --git a/lib/fsk4hf/wspr5d.f90 b/lib/fsk4hf/wspr5d.f90
index 59614ac71..cdda78214 100644
--- a/lib/fsk4hf/wspr5d.f90
+++ b/lib/fsk4hf/wspr5d.f90
@@ -188,6 +188,7 @@ program wspr5d
         max_iterations=40
         ifer=0
         call bpdecode300(llr,apmask,max_iterations,decoded,niterations,cw)
+        if(niterations.lt.0) call osd300(llr,4,decoded,niterations,cw)
         nbadcrc=0
         if(niterations.ge.0) call chkcrc10(decoded,nbadcrc)
         if(niterations.lt.0 .or. nbadcrc.ne.0) ifer=1