diff --git a/targets/mbedos5/Makefile b/targets/mbedos5/Makefile
index 9ac853724..341e2068e 100644
--- a/targets/mbedos5/Makefile
+++ b/targets/mbedos5/Makefile
@@ -63,7 +63,7 @@ library: .mbed ../../.mbedignore
 	mbed compile $(MBED_CLI_FLAGS) --library
 
 clean:
-	rm -rf .build/$(BOARD)
+	rm -rf ./BUILD/$(BOARD)
 
 js2c: js/main.js js/flash_leds.js
 	python ../../tools/js2c.py --ignore pins.js
diff --git a/targets/mbedos5/template-mbedignore.txt b/targets/mbedos5/template-mbedignore.txt
index 97a2f04ad..d60ed0996 100644
--- a/targets/mbedos5/template-mbedignore.txt
+++ b/targets/mbedos5/template-mbedignore.txt
@@ -2,6 +2,9 @@ cmake/*
 docs/*
 jerry-libc/*
 jerry-main/*
+jerry-port/default/default-date.c
+jerry-port/default/default-fatal.c
+jerry-port/default/default-io.c
 targets/*
 tests/*
 third-party/*