diff --git a/openup b/openup
index 415c489..9761675 100755
--- a/openup
+++ b/openup
@@ -76,13 +76,13 @@ fi
 unset _BPLIST
 
 _TMPDIR="${TMPDIR:=/tmp}"
-_TMPCERT=$(mktemp -p ${_TMPDIR} openup-pkg_cert.XXXXXX) || exit 1
-_TMPSPLITCERT=$(mktemp -p ${_TMPDIR} openup-split_cert.XXXXXX) || exit 1
-_TMPVUXML=$(mktemp -p ${_TMPDIR} openup-vuxml.XXXXXX) || exit 1
+_TMPCERT=$(mktemp -p ${_TMPDIR} .openup-pkg_cert.XXXXXXXXXX) || exit 1
+_TMPSPLITCERT=$(mktemp -p ${_TMPDIR} .openup-split_cert.XXXXXXXXXX) || exit 1
+_TMPVUXML=$(mktemp -p ${_TMPDIR} .openup-vuxml.XXXXXXXXXX) || exit 1
 
 export PKG_PATH=${PKG_PATH_UPDATE}:${PKG_PATH_MAIN}
 
-trap "rm -f ${_TMPDIR}/openup-*" 1 2 3 13 15
+trap "rm -f ${_TMPDIR}/.openup-*" 1 2 3 13 15
 
 pr_bigarrow() {
 	if [ -z "${checkmode}" ]; then
@@ -221,4 +221,4 @@ else
 	check_vuxml
 fi
 
-rm -f ${_TMPDIR}/openup-*
+rm -f ${_TMPDIR}/.openup-*