diff --git a/lib/ft8_decode.f90 b/lib/ft8_decode.f90
index 73d0f8c2a..c0b0584f4 100644
--- a/lib/ft8_decode.f90
+++ b/lib/ft8_decode.f90
@@ -145,8 +145,9 @@ contains
     if(ndepth.eq.1) npass=1
     do ipass=1,npass
       newdat=.true.
-      syncmin=1.3
-      if(ndepth.le.2) syncmin=1.6
+      syncmin=1.2
+      if(ndepth.eq.1) syncmin=1.6
+      if(ndepth.eq.2) syncmin=1.4
       if(ipass.eq.1) then
         lsubtract=.true.
         ndeep=ndepth