diff --git a/meta/conf/bitbake.conf b/meta/conf/bitbake.conf
index 3ef2deb088..386e6e0a3e 100644
--- a/meta/conf/bitbake.conf
+++ b/meta/conf/bitbake.conf
@@ -405,7 +405,7 @@ STAMP = "${STAMPS_DIR}/${MULTIMACH_TARGET_SYS}/${PN}/${PV}"
 STAMPCLEAN = "${STAMPS_DIR}/${MULTIMACH_TARGET_SYS}/${PN}/*-*"
 BASE_WORKDIR ?= "${TMPDIR}/work"
 WORKDIR = "${BASE_WORKDIR}/${MULTIMACH_TARGET_SYS}/${PN}/${PV}"
-UNPACKDIR ??= "${WORKDIR}/sources-unpack"
+UNPACKDIR ?= "${WORKDIR}/sources-unpack"
 T = "${WORKDIR}/temp"
 D = "${WORKDIR}/image"
 S = "${WORKDIR}/${BP}"