diff --git a/platforms/posix/src/px4/common/px4-alias.sh_in b/platforms/posix/src/px4/common/px4-alias.sh_in
index 4dd43e877f..61f0af5579 100644
--- a/platforms/posix/src/px4/common/px4-alias.sh_in
+++ b/platforms/posix/src/px4/common/px4-alias.sh_in
@@ -1,6 +1,7 @@
 #!/bin/sh
 
 # File is auto-generated by cmake compilation, do not edit.
+R="`pwd`/"
 
 # Map the NuttX-style variable definition 'set <var> <value>' to something that
 # bash and alternatives understand
@@ -9,37 +10,6 @@ _set() {
 	eval $1=\"$2\"
 }
 alias set=_set
-# alternative method with an alias:
-# alias set='f(){ set -- "$1=$2"; eval "$1"; unset -f f; }; eval f'
-
-# Execute another shell script.
-# $1: Path to the script, (optionally starts with /, to match with the NuttX
-# scripts)
-sh() {
-	script="$1"
-	case "$script" in
-	"/"*)
-		script="$script"
-		;;
-	*)
-		script="/$script"
-		;;
-	esac
-	. "$(pwd)$script"
-}
-
-source() {
-	script="$1"
-	case "$script" in
-	"/"*)
-		script="$script"
-		;;
-	*)
-		script="/$script"
-		;;
-	esac
-	. "$(pwd)$script"
-}
 
 # Don't stop on errors.
 #set -e