diff --git a/helper/build_config b/helper/build_config
index b3e83d9a..8862f416 100755
--- a/helper/build_config
+++ b/helper/build_config
@@ -82,10 +82,9 @@ tt_tmp_output_file="$(mktemp ngcpcfg."${tt_tmp_output_file_base}".XXXXXXXXXX)"
 
 log_debug "Output file ${output_file} based on ${input_file}"
 log_debug "Executing: $TT_WRAPPER ${input_file} > ${tt_tmp_output_file}"
-log_debug "      and: cat ${tt_tmp_output_file} > ${output_file}"
+log_debug "      and: mv ${tt_tmp_output_file} ${output_file}"
 if "$TT_WRAPPER" "${input_file}" > "${tt_tmp_output_file}" 2>/dev/null &&
-   cat "${tt_tmp_output_file}" > "${output_file}" 2>/dev/null ; then
-  rm -f "${tt_tmp_output_file}"
+   mv "${tt_tmp_output_file}" "${output_file}" ; then
   log_info "Generating ${output_file}: OK"
   RC=0
 else