diff --git a/ROMFS/px4fmu_common/init.d/rc.vehicle_setup b/ROMFS/px4fmu_common/init.d/rc.vehicle_setup
index 0f676668d39..87608e44ba2 100644
--- a/ROMFS/px4fmu_common/init.d/rc.vehicle_setup
+++ b/ROMFS/px4fmu_common/init.d/rc.vehicle_setup
@@ -26,10 +26,10 @@ then
 	param set MAV_TYPE ${MAV_TYPE}
 
 	# Load mixer and configure outputs.
-	. /etc/init.d/rc.interface
+	source /etc/init.d/rc.interface
 
 	# Start standard fixedwing apps.
-	. /etc/init.d/rc.fw_apps
+	source /etc/init.d/rc.fw_apps
 fi
 
 #
@@ -78,10 +78,10 @@ then
 	param set MAV_TYPE ${MAV_TYPE}
 
 	# Load mixer and configure outputs.
-	. /etc/init.d/rc.interface
+	source /etc/init.d/rc.interface
 
 	# Start standard multicopter apps.
-	. /etc/init.d/rc.mc_apps
+	source /etc/init.d/rc.mc_apps
 fi
 
 #
@@ -105,10 +105,10 @@ then
 	param set MAV_TYPE ${MAV_TYPE}
 
 	# Load mixer and configure outputs.
-	. /etc/init.d/rc.interface
+	source /etc/init.d/rc.interface
 
 	# Start standard UGV apps.
-	. /etc/init.d/rc.rover_apps
+	source /etc/init.d/rc.rover_apps
 fi
 
 #
@@ -141,10 +141,10 @@ then
 	param set MAV_TYPE ${MAV_TYPE}
 
 	# Load mixer and configure outputs.
-	. /etc/init.d/rc.interface
+	source /etc/init.d/rc.interface
 
 	# Start standard vtol apps.
-	. /etc/init.d/rc.vtol_apps
+	source /etc/init.d/rc.vtol_apps
 fi
 
 #
@@ -167,10 +167,10 @@ then
 	param set MAV_TYPE ${MAV_TYPE}
 
 	# Load mixer and configure outputs.
-	. /etc/init.d/rc.interface
+	source /etc/init.d/rc.interface
 
 	# Start airship apps.
-	. /etc/init.d/rc.airship_apps
+	source /etc/init.d/rc.airship_apps
 fi
 
 #
@@ -184,10 +184,10 @@ then
 	fi
 
 	# Load mixer and configure outputs.
-	. /etc/init.d/rc.interface
+	source /etc/init.d/rc.interface
 
 	# Start standard vtol apps.
-	. /etc/init.d/rc.uuv_apps
+	source /etc/init.d/rc.uuv_apps
 
 fi
 
diff --git a/platforms/posix/src/px4/common/px4-alias.sh_in b/platforms/posix/src/px4/common/px4-alias.sh_in
index edf4e576db2..4dd43e877f6 100644
--- a/platforms/posix/src/px4/common/px4-alias.sh_in
+++ b/platforms/posix/src/px4/common/px4-alias.sh_in
@@ -28,6 +28,19 @@ sh() {
 	. "$(pwd)$script"
 }
 
+source() {
+	script="$1"
+	case "$script" in
+	"/"*)
+		script="$script"
+		;;
+	*)
+		script="/$script"
+		;;
+	esac
+	. "$(pwd)$script"
+}
+
 # Don't stop on errors.
 #set -e