diff --git a/packages/linux-driver-addons/dvb/crazycat/package.mk b/packages/linux-driver-addons/dvb/crazycat/package.mk
index 83474aaddc..209b454ff1 100644
--- a/packages/linux-driver-addons/dvb/crazycat/package.mk
+++ b/packages/linux-driver-addons/dvb/crazycat/package.mk
@@ -20,7 +20,7 @@ PKG_ADDON_VERSION="${ADDON_VERSION}.${PKG_REV}"
 
 PKG_KERNEL_CFG_FILE=$(kernel_config_path) || die
 
-if ! grep -q ^CONFIG_USB_PCI= ${PKG_KERNEL_CFG_FILE} ; then
+if ! grep -q ^CONFIG_USB_PCI= ${PKG_KERNEL_CFG_FILE}; then
   PKG_PATCH_DIRS="disable-pci"
 fi
 
@@ -30,21 +30,21 @@ pre_make_target() {
 }
 
 make_target() {
-  cp -RP $(get_build_dir media_tree_cc)/* $PKG_BUILD/linux
+  cp -RP $(get_build_dir media_tree_cc)/* ${PKG_BUILD}/linux
 
   # make config all
-  kernel_make VER=$KERNEL_VER SRCDIR=$(kernel_path) allyesconfig
+  kernel_make VER=${KERNEL_VER} SRCDIR=$(kernel_path) allyesconfig
 
   # hack to workaround media_build bug
-  if [ "$PROJECT" = Rockchip ]; then
+  if [ "${PROJECT}" = Rockchip ]; then
     sed -e 's/CONFIG_DVB_CXD2820R=m/# CONFIG_DVB_CXD2820R is not set/g' -i v4l/.config
     sed -e 's/CONFIG_DVB_LGDT3306A=m/# CONFIG_DVB_LGDT3306A is not set/g' -i v4l/.config
   fi
 
   # add menuconfig to edit .config
-  kernel_make VER=$KERNEL_VER SRCDIR=$(kernel_path)
+  kernel_make VER=${KERNEL_VER} SRCDIR=$(kernel_path)
 }
 
 makeinstall_target() {
-  install_driver_addon_files "$PKG_BUILD/v4l/"
+  install_driver_addon_files "${PKG_BUILD}/v4l/"
 }
diff --git a/packages/linux-driver-addons/dvb/depends/media_tree/package.mk b/packages/linux-driver-addons/dvb/depends/media_tree/package.mk
index eebf1ad748..3542173da9 100644
--- a/packages/linux-driver-addons/dvb/depends/media_tree/package.mk
+++ b/packages/linux-driver-addons/dvb/depends/media_tree/package.mk
@@ -8,13 +8,13 @@ PKG_LICENSE="GPL"
 PKG_SITE="https://git.linuxtv.org/media_tree.git"
 PKG_URL="http://linuxtv.org/downloads/drivers/linux-media-${PKG_VERSION}.tar.bz2"
 PKG_DEPENDS_TARGET="toolchain"
-PKG_NEED_UNPACK="$LINUX_DEPENDS"
+PKG_NEED_UNPACK="${LINUX_DEPENDS}"
 PKG_LONGDESC="Source of Linux Kernel media_tree subsystem to build with media_build."
 PKG_TOOLCHAIN="manual"
 
 unpack() {
-  mkdir -p $PKG_BUILD/
-  tar -xf $SOURCES/$PKG_NAME/$PKG_NAME-$PKG_VERSION.tar.bz2 -C $PKG_BUILD/
+  mkdir -p ${PKG_BUILD}/
+  tar -xf ${SOURCES}/${PKG_NAME}/${PKG_NAME}-${PKG_VERSION}.tar.bz2 -C ${PKG_BUILD}/
 }
 
 post_unpack() {
@@ -22,7 +22,7 @@ post_unpack() {
   # without removing atomisp there a lot additional includes that 
   # slowdown build process after modpost from 3min to 6min
   # even if atomisp is disabled via kernel.conf
-  rm -rf $PKG_BUILD/drivers/staging/media/atomisp
+  rm -rf ${PKG_BUILD}/drivers/staging/media/atomisp
   sed -i 's|^.*drivers/staging/media/atomisp.*$||' \
-    $PKG_BUILD/drivers/staging/media/Kconfig
+    ${PKG_BUILD}/drivers/staging/media/Kconfig
 }
diff --git a/packages/linux-driver-addons/dvb/depends/media_tree_cc/package.mk b/packages/linux-driver-addons/dvb/depends/media_tree_cc/package.mk
index 61b3512866..ba856abfbc 100644
--- a/packages/linux-driver-addons/dvb/depends/media_tree_cc/package.mk
+++ b/packages/linux-driver-addons/dvb/depends/media_tree_cc/package.mk
@@ -6,15 +6,15 @@ PKG_VERSION="2020-02-14"
 PKG_SHA256="c81d0412c8f237ecf30100ba1260625ca25df463102af331b063f4a7dca164f5"
 PKG_LICENSE="GPL"
 PKG_SITE="https://bitbucket.org/CrazyCat/media_build/downloads/"
-PKG_URL="$DISTRO_SRC/$PKG_NAME-$PKG_VERSION.tar.bz2"
+PKG_URL="${DISTRO_SRC}/${PKG_NAME}-${PKG_VERSION}.tar.bz2"
 PKG_DEPENDS_TARGET="toolchain"
-PKG_NEED_UNPACK="$LINUX_DEPENDS"
+PKG_NEED_UNPACK="${LINUX_DEPENDS}"
 PKG_LONGDESC="Source of Linux Kernel media_tree subsystem to build with media_build."
 PKG_TOOLCHAIN="manual"
 
 unpack() {
-  mkdir -p $PKG_BUILD/
-  tar -xf $SOURCES/$PKG_NAME/$PKG_NAME-$PKG_VERSION.tar.bz2 -C $PKG_BUILD/
+  mkdir -p ${PKG_BUILD}/
+  tar -xf ${SOURCES}/${PKG_NAME}/${PKG_NAME}-${PKG_VERSION}.tar.bz2 -C ${PKG_BUILD}/
 }
 
 post_unpack() {
@@ -22,7 +22,7 @@ post_unpack() {
   # without removing atomisp there a lot additional includes that 
   # slowdown build process after modpost from 3min to 6min
   # even if atomisp is disabled via kernel.conf
-  rm -rf $PKG_BUILD/drivers/staging/media/atomisp
+  rm -rf ${PKG_BUILD}/drivers/staging/media/atomisp
   sed -i 's|^.*drivers/staging/media/atomisp.*$||' \
-    $PKG_BUILD/drivers/staging/media/Kconfig
+    ${PKG_BUILD}/drivers/staging/media/Kconfig
 }
diff --git a/packages/linux-driver-addons/dvb/digital_devices/package.mk b/packages/linux-driver-addons/dvb/digital_devices/package.mk
index 1834ca491b..6145281b6c 100644
--- a/packages/linux-driver-addons/dvb/digital_devices/package.mk
+++ b/packages/linux-driver-addons/dvb/digital_devices/package.mk
@@ -10,7 +10,7 @@ PKG_SITE="https://github.com/DigitalDevices/dddvb/"
 PKG_URL="https://github.com/DigitalDevices/dddvb/archive/${PKG_VERSION}.tar.gz"
 PKG_DEPENDS_TARGET="toolchain linux"
 PKG_BUILD_DEPENDS_TARGET="toolchain linux"
-PKG_NEED_UNPACK="$LINUX_DEPENDS"
+PKG_NEED_UNPACK="${LINUX_DEPENDS}"
 PKG_SECTION="driver.dvb"
 PKG_LONGDESC="DVB driver for Digital Devices cards"
 
@@ -25,5 +25,5 @@ make_target() {
 }
 
 makeinstall_target() {
-  install_driver_addon_files "$PKG_BUILD/ddbridge $PKG_BUILD/dvb-core $PKG_BUILD/frontends"
+  install_driver_addon_files "${PKG_BUILD}/ddbridge ${PKG_BUILD}/dvb-core ${PKG_BUILD}/frontends"
 }
diff --git a/packages/linux-driver-addons/dvb/dvb-latest/package.mk b/packages/linux-driver-addons/dvb/dvb-latest/package.mk
index b601ae3b10..ccc016af0c 100644
--- a/packages/linux-driver-addons/dvb/dvb-latest/package.mk
+++ b/packages/linux-driver-addons/dvb/dvb-latest/package.mk
@@ -20,7 +20,7 @@ PKG_ADDON_VERSION="${ADDON_VERSION}.${PKG_REV}"
 
 PKG_KERNEL_CFG_FILE=$(kernel_config_path) || die
 
-if ! grep -q ^CONFIG_USB_PCI= ${PKG_KERNEL_CFG_FILE} ; then
+if ! grep -q ^CONFIG_USB_PCI= ${PKG_KERNEL_CFG_FILE}; then
   PKG_PATCH_DIRS="disable-pci"
 fi
 
@@ -30,14 +30,14 @@ pre_make_target() {
 }
 
 make_target() {
-  cp -RP $(get_build_dir media_tree)/* $PKG_BUILD/linux
+  cp -RP $(get_build_dir media_tree)/* ${PKG_BUILD}/linux
 
   # make config all
-  kernel_make VER=$KERNEL_VER SRCDIR=$(kernel_path) allyesconfig
+  kernel_make VER=${KERNEL_VER} SRCDIR=$(kernel_path) allyesconfig
 
-  kernel_make VER=$KERNEL_VER SRCDIR=$(kernel_path)
+  kernel_make VER=${KERNEL_VER} SRCDIR=$(kernel_path)
 }
 
 makeinstall_target() {
-  install_driver_addon_files "$PKG_BUILD/v4l/"
+  install_driver_addon_files "${PKG_BUILD}/v4l/"
 }