diff --git a/lib/jt9.f90 b/lib/jt9.f90
index 469a07a1e..104612097 100644
--- a/lib/jt9.f90
+++ b/lib/jt9.f90
@@ -161,8 +161,6 @@ program jt9
 ! Import FFTW wisdom, if available
   wisfile=trim(data_dir)//'/jt9_wisdom.dat'// C_NULL_CHAR
   iret=fftwf_import_wisdom_from_filename(wisfile)
-  open(19,file=trim(data_dir)//'/false_decodes.txt',status='unknown',     &
-       position='append')
 
   ntry65a=0
   ntry65b=0