diff --git a/scripts/unpack b/scripts/unpack
index 1c5876c862..81668f0115 100755
--- a/scripts/unpack
+++ b/scripts/unpack
@@ -55,7 +55,7 @@ pkg_lock_status "ACTIVE" "${PKG_NAME}" "unpack"
 
 ${SCRIPTS}/get "${PKG_NAME}"
 
-if [ -d "${SOURCES}/${PKG_NAME}" -o -d "${PKG_DIR}/sources" ]; then
+if [ -d "${SOURCES}/${PKG_NAME}" -o -d "${PKG_DIR}/sources" ] || pkg_call_exists unpack; then
   build_msg "CLR_UNPACK" "UNPACK" "${PKG_NAME}" "indent"
 
   # unpack into a unique location as unpacking into a single ${BUILD} directory is not thread-safe