diff --git a/mbed-os-to-arduino b/mbed-os-to-arduino
index f6654345..2fcb81b4 100755
--- a/mbed-os-to-arduino
+++ b/mbed-os-to-arduino
@@ -145,7 +145,13 @@ generate_includes () {
 	echo -n " copying to destination... "
 
 	cut -d'/' -f3- < "$ARDUINOVARIANT"/includes.txt | grep '^targets/TARGET_' \
-	| sed -e 's#\(.*\)#+ \1#' -e '$a+ targets/' -e '$a+ *.h' -e '$a- *' \
+	| sed -e 's#\(.*\)#+ \1#' \
+		  -e '$a\
+		  + targets/' \
+		  -e '$a\
+		  + *.h' \
+		  -e '$a\
+		  - *' \
 	| rsync -avvz --include-from=- mbed-os/ "$ARDUINOCOREMBED"/
 
 	echo " done."
@@ -327,4 +333,4 @@ Using Arduino as an mbed library
 
 echo -e "arduino/cores/arduino/main.cpp\n arduino/cores/arduino/mbed/\narduino/libraries/" > .mbedignore
 #add ARDUINO_AS_MBED_LIBRARY=1 to macros section in mbed_app.json
-echo "https://github.com/arduino/ArduinoCore-mbed#bf6e64771ebe20285b0364756dff856ebbc679dc" > arduino.lib
\ No newline at end of file
+echo "https://github.com/arduino/ArduinoCore-mbed#bf6e64771ebe20285b0364756dff856ebbc679dc" > arduino.lib