diff --git a/projects/ARM/options b/projects/ARM/options
index 2d5c0afb69..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"
diff --git a/projects/Amlogic/options b/projects/Amlogic/options
index 2128559a61..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"
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/Samsung/options b/projects/Samsung/options
index fbc11e23dc..cd915dd73c 100644
--- a/projects/Samsung/options
+++ b/projects/Samsung/options
@@ -70,8 +70,8 @@
   # 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"