diff --git a/libisoburn/trunk/releng/run_all_releng b/libisoburn/trunk/releng/run_all_releng
index c81f8f04..1813e986 100755
--- a/libisoburn/trunk/releng/run_all_releng
+++ b/libisoburn/trunk/releng/run_all_releng
@@ -191,7 +191,7 @@ fi
       if [ -f "${CLOG}" ]; then
           set +e
 	  # lines, perl regex, leading tabs
-          grep -n -PT "${LIST_KWD}" "${CLOG}" | tee -a ${CLOG}
+          grep -n -P "${LIST_KWD}" "${CLOG}" | tee -a ${CLOG}
 	  RET_GREP="$?"
           case ${RET_GREP} in
               0) # found