diff --git a/uac b/uac
index 1f93438..e284ee7 100755
--- a/uac
+++ b/uac
@@ -778,9 +778,9 @@ ua_output_file_hash="-"
 # sort and uniq
 sort_uniq_file "${TEMP_DATA_DIR}/.output_file.tmp" 2>>"${UAC_STDERR_LOG_FILE}"
 # add uac.log to the list of files to be archived/copied within the output file
-echo "uac.log" >>"${TEMP_DATA_DIR}/.output_file.tmp"
+echo "uac.log" | cat - "${TEMP_DATA_DIR}/.output_file.tmp" >"${TEMP_DATA_DIR}/.output_file.tmp"
 # add uac.log.stderr to the list of files to be archived/copied within the output file
-echo "uac.log.stderr" >>"${TEMP_DATA_DIR}/.output_file.tmp"
+echo "uac.log.stderr" | cat - "${TEMP_DATA_DIR}/.output_file.tmp" >"${TEMP_DATA_DIR}/.output_file.tmp"
 
 # create output file
 if command_exists "tar"; then