diff --git a/ci-automation/tapfile_helper_lib.sh b/ci-automation/tapfile_helper_lib.sh
index 32215bbbec..805ae62a8a 100644
--- a/ci-automation/tapfile_helper_lib.sh
+++ b/ci-automation/tapfile_helper_lib.sh
@@ -122,10 +122,12 @@ function tap_ingest_tapfile() {
                     in_error_message=false
                     has_error_message="true"
                 else
+                    # remove special characters and unicode. Jenkins TAP parser don't unicode.
                     echo -e "$line" \
-                        | sed -e 's/^Error: "--- FAIL: /"/' -e 's/^[[:space:]]*//' \
+                        | LC_ALL=C sed -e 's/^Error: "--- FAIL: /"/' -e 's/^[[:space:]]*//' \
                               -e "s/[>\\\"']/_/g" -e 's/[[:space:]]/ /g' \
                               -e 's/.\{200\}/&\n/g' \
+                              -e 's/[^\x00-\x7F]/?/g' \
                         >> "${error_message_file}"
                     continue
                 fi