diff --git a/projects/ARM/options b/projects/ARM/options
index cba5cd8cf3..f695465bef 100644
--- a/projects/ARM/options
+++ b/projects/ARM/options
@@ -46,7 +46,7 @@
     KODI_DVDCSS_SUPPORT="no"
 
   # additional drivers to install
-    ADDITIONAL_DRIVERS=""
+    ADDITIONAL_DRIVERS+=""
 
   # build and install bluetooth support (yes / no)
     BLUETOOTH_SUPPORT="no"
@@ -124,7 +124,7 @@
     SWAP_SUPPORT="no"
 
   # additional packages to install
-    ADDITIONAL_PACKAGES=""
+    ADDITIONAL_PACKAGES+=""
 
   # build with installer (yes / no)
     INSTALLER_SUPPORT="no"
diff --git a/projects/Allwinner/options b/projects/Allwinner/options
index 754611042d..37578dfda3 100644
--- a/projects/Allwinner/options
+++ b/projects/Allwinner/options
@@ -63,4 +63,4 @@
     DEBUG_TTY="/dev/console"
 
   # additional packages to install:
-    ADDITIONAL_PACKAGES="dt-overlays"
+    ADDITIONAL_PACKAGES+=" dt-overlays"
diff --git a/projects/Amlogic/options b/projects/Amlogic/options
index 475f518447..b456ff6536 100644
--- a/projects/Amlogic/options
+++ b/projects/Amlogic/options
@@ -63,8 +63,8 @@
   # additional drivers to install:
   # for a list of additional drivers see packages/linux-drivers
   # Space separated list is supported,
-  # e.g. ADDITIONAL_DRIVERS="DRIVER1 DRIVER2"
-    ADDITIONAL_DRIVERS=""
+  # e.g. ADDITIONAL_DRIVERS+=" DRIVER1 DRIVER2"
+    ADDITIONAL_DRIVERS+=""
 
   # build and install driver addons (yes / no)
     DRIVER_ADDONS_SUPPORT="no"
@@ -75,7 +75,7 @@
     DRIVER_ADDONS="crazycat dvb-latest"
 
   # additional packages to install:
-    ADDITIONAL_PACKAGES="dtc ethmactool emmctool flashrom"
+    ADDITIONAL_PACKAGES+=" dtc ethmactool emmctool flashrom"
 
   # use the kernel CEC framework for libcec (yes / no)
     CEC_FRAMEWORK_SUPPORT="yes"
diff --git a/projects/Generic/options b/projects/Generic/options
index 841334559b..59c98474b6 100644
--- a/projects/Generic/options
+++ b/projects/Generic/options
@@ -59,8 +59,8 @@
   # additional drivers to install:
   # for a list of additional drivers see packages/linux-drivers
   # Space separated list is supported,
-  # e.g. ADDITIONAL_DRIVERS="DRIVER1 DRIVER2"
-    ADDITIONAL_DRIVERS="$ADDITIONAL_DRIVERS bcm_sta"
+  # e.g. ADDITIONAL_DRIVERS+=" DRIVER1 DRIVER2"
+    ADDITIONAL_DRIVERS+=" bcm_sta"
 
   # build and install driver addons (yes / no)
     DRIVER_ADDONS_SUPPORT="no"
diff --git a/projects/RPi/options b/projects/RPi/options
index 61b00e101f..1f0041f90f 100644
--- a/projects/RPi/options
+++ b/projects/RPi/options
@@ -106,8 +106,8 @@
   # additional drivers to install:
   # for a list of additional drivers see packages/linux-drivers
   # Space separated list is supported,
-  # e.g. ADDITIONAL_DRIVERS="DRIVER1 DRIVER2"
-    ADDITIONAL_DRIVERS="$ADDITIONAL_DRIVERS bcm2835-driver"
+  # e.g. ADDITIONAL_DRIVERS+=" DRIVER1 DRIVER2"
+    ADDITIONAL_DRIVERS+=" bcm2835-driver"
 
     if [ "${ALSA_SUPPORT}" = "yes" ]; then
       ADDITIONAL_DRIVERS+=" rpi-cirrus-config"
diff --git a/projects/Rockchip/options b/projects/Rockchip/options
index d68f7f5843..8d0b12973e 100644
--- a/projects/Rockchip/options
+++ b/projects/Rockchip/options
@@ -62,7 +62,7 @@
     FIRMWARE="misc-firmware wlan-firmware dvb-firmware brcmfmac_sdio-firmware"
 
   # additional packages to install
-    ADDITIONAL_PACKAGES="dtc"
+    ADDITIONAL_PACKAGES+=" dtc"
 
   # build and install CEC framework support (yes / no)
     CEC_FRAMEWORK_SUPPORT="yes"
diff --git a/projects/Samsung/options b/projects/Samsung/options
index f1ab3a3187..cd915dd73c 100644
--- a/projects/Samsung/options
+++ b/projects/Samsung/options
@@ -64,14 +64,14 @@
 
   # additional packages to install:
   # Space separated list is supported,
-  # e.g. ADDITIONAL_PACKAGES="PACKAGE1 PACKAGE2"
-    ADDITIONAL_PACKAGES="dtc emmctool"
+  # e.g. ADDITIONAL_PACKAGES+=" PACKAGE1 PACKAGE2"
+    ADDITIONAL_PACKAGES+=" dtc emmctool"
 
   # additional drivers to install:
   # for a list of additional drivers see packages/linux-drivers
   # Space separated list is supported,
-  # e.g. ADDITIONAL_DRIVERS="DRIVER1 DRIVER2"
-    ADDITIONAL_DRIVERS=""
+  # e.g. ADDITIONAL_DRIVERS+=" DRIVER1 DRIVER2"
+    ADDITIONAL_DRIVERS+=""
 
   # build and install driver addons (yes / no)
     DRIVER_ADDONS_SUPPORT="no"