diff --git a/config/functions b/config/functions
index 559faebf3d..3517bf54de 100644
--- a/config/functions
+++ b/config/functions
@@ -1371,6 +1371,13 @@ enable_service() {
 
 
 ### MULTI-THREADED FUNCTION HELPERS ###
+# flocks: 94 (pkg_lock_status)
+#         95 (scripts/pkgbuild)
+#         96 (acquire_exclusive_lock)
+#         97 (acquire_update_lock)
+#         98 (pkg_lock)
+#         99 (scripts/get)
+
 # Test build type so that these functions are a no-op during non-multithreaded builds.
 
 # Prevent concurrent modifications to a package during certain activities.
@@ -1540,6 +1547,20 @@ exec_thread_safe() {
   return ${result}
 }
 
+# A lightweight target specific lock (eg. image, sysroot)
+acquire_update_lock() {
+  is_sequential_build && return 0
+
+  exec 97>"${THREAD_CONTROL}/locks/.update.${1}"
+  flock --exclusive 97
+}
+
+release_update_lock() {
+  is_sequential_build && return 0
+
+  flock --unlock 97 2>/dev/null
+}
+
 # Use distribution functions if any
 if [ -f "distributions/$DISTRO/config/functions" ]; then
   . distributions/$DISTRO/config/functions
diff --git a/scripts/build b/scripts/build
index 308736ed37..9dc4ca748b 100755
--- a/scripts/build
+++ b/scripts/build
@@ -444,8 +444,13 @@ for i in $(find "${SYSROOT_PREFIX}" -type l 2>/dev/null); do
 done
 
 # Transfer the new sysroot content to the shared sysroot
+acquire_update_lock sysroot
+
 mkdir -p "${PKG_ORIG_SYSROOT_PREFIX}"
 cp -PRf "${SYSROOT_PREFIX}"/* "${PKG_ORIG_SYSROOT_PREFIX}"
+
+release_update_lock
+
 rm -rf "${SYSROOT_PREFIX}"
 
 export SYSROOT_PREFIX="${PKG_ORIG_SYSROOT_PREFIX}"
diff --git a/scripts/install b/scripts/install
index 117d4f707c..c3dbba7368 100755
--- a/scripts/install
+++ b/scripts/install
@@ -64,6 +64,8 @@ pkg_lock_status "ACTIVE" "${PKG_NAME}:${TARGET}" "install"
 
 build_msg "CLR_INSTALL" "INSTALL" "${PKG_NAME} $(print_color CLR_TARGET "(${TARGET})")" "indent"
 
+acquire_update_lock image
+
 mkdir -p ${INSTALL}
 
 if [ "${TARGET}" = "target" ] ; then
@@ -169,6 +171,8 @@ if [ "${TARGET}" = "target" ] ; then
   pkg_call_exists post_install && pkg_call post_install
 fi
 
+release_update_lock
+
 touch ${STAMP}
 
 pkg_lock_status "UNLOCK" "${PKG_NAME}:${TARGET}" "install" "installed"