diff --git a/lib/decoder.f90 b/lib/decoder.f90
index 59fbc82e5..947420724 100644
--- a/lib/decoder.f90
+++ b/lib/decoder.f90
@@ -147,8 +147,9 @@ subroutine multimode_decoder(ss,id2,params,nfsample)
              access='stream')
         write(47) params%yymmdd,params%nutc,id2(1:20),id2(1:180000)
         close(47)
-        cmnd=trim(exe_dir)//'/sfrx '//trim(temp_dir)//'/fort.47'
-        call execute_command_line(cmnd)
+        cmnd='"'//trim(exe_dir)//'/sfrx" "'//trim(temp_dir)//'/fort.47"'
+        call execute_command_line(cmnd,exitstat=ierr)
+        if(ierr.ne.0) print*,trim(cmnd),' failed'
      else
         call timer('decft8  ',0)
         newdat=params%newdat