diff --git a/build b/build
index 7a75a36a..551e9031 100755
--- a/build
+++ b/build
@@ -18,12 +18,7 @@ eval "$(setvars "" option aur_notice tmpdir)"
 tmpdir_was_set="y"
 set | grep TMPDIR 1>/dev/null 2>/dev/null || tmpdir_was_set="n"
 if [ "${tmpdir_was_set}" = "y" ]; then
-	tmpdir="${TMPDIR##*/}"
-	tmpdir="${TMPDIR%_*}"
-	if [ "${tmpdir}" = "lbmk" ]; then
-		tmpdir=""
-		tmpdir_was_set="n"
-	fi
+	[ "${TMPDIR%_*}" = "/tmp/lbmk" ] || tmpdir_was_set="n"
 fi
 if [ "${tmpdir_was_set}" = "n" ]; then
 	export TMPDIR="/tmp"
@@ -31,8 +26,8 @@ if [ "${tmpdir_was_set}" = "n" ]; then
 	export TMPDIR="${tmpdir}"
 else
 	export TMPDIR="${TMPDIR}"
+	tmpdir="${TMPDIR}"
 fi
-tmpdir="${TMPDIR}"
 
 linkpath="${0}"
 linkname="${linkpath##*/}"