diff --git a/testssl.sh b/testssl.sh
index 6b694e4..ef7be21 100755
--- a/testssl.sh
+++ b/testssl.sh
@@ -20518,7 +20518,9 @@ maketempf() {
           fi
           TEMPDIR=$(mktemp -d "$PWD/testssl.XXXXXX") || exit $ERR_FCREATE
      fi
-     TMPFILE=$TEMPDIR/tempfile.txt || exit $ERR_FCREATE
+     ls "$TEMPDIR/" 2>/dev/null || fatal "temporary directory needed not readable" $ERR_FCREATE
+     TMPFILE=$TEMPDIR/tempfile.txt
+     touch $TMPFILE 2>/dev/null || fatal "temporary directory needed not writeable" $ERR_FCREATE
      if [[ "$DEBUG" -eq 0 ]]; then
           ERRFILE="/dev/null"
      else