diff --git a/app/Makefile b/app/Makefile
index b48c3de1..3a58b953 100755
--- a/app/Makefile
+++ b/app/Makefile
@@ -66,35 +66,10 @@ endif
 include $(CURDIR)/../deps/ledger-zxlib/makefiles/Makefile.platform
 DEFINES += HAVE_HASH HAVE_BLAKE2 HAVE_SHA256 HAVE_SHA512
 CFLAGS += -I$(MY_DIR)/../deps/tinycbor/src
-CFLAGS += -g3 -ggdb3 -Og
+CFLAGS += -g3 -ggdb3 -O3
 APP_SOURCE_PATH += $(MY_DIR)/../deps/tinycbor-ledger
 APP_SOURCE_PATH += $(MY_DIR)/../deps/jsmn/src
 
-#DEBUG = 10
-
-# Enabling debug PRINTF_S
-ifneq ($(DEBUG),0)
-        $(warning DEBUG enabled)
-        DEFINES += OS_IO_SEPROXYHAL HAVE_BAGL HAVE_SPRINTF
-	DEFINES += HAVE_STACK_OVERFLOW_CHECK
-	SDK_SOURCE_PATH  += lib_stusb lib_stusb_impl lib_u2f
-	DEFINES   += HAVE_IO_USB HAVE_L4_USBLIB IO_HID_EP_LENGTH=64 HAVE_USB_APDU
-
-        ifeq ($(DEBUG),10)
-                $(warning Using semihosted PRINTF_S. Only run with speculos!)
-                CFLAGS    += -include src/dbg/debug.h
-                DEFINES   += HAVE_PRINTF PRINTF_S=semihosted_printf
-        else
-                ifeq ($(TARGET_NAME),TARGET_NANOX)
-                        DEFINES   += HAVE_PRINTF PRINTF_S=mcu_usb_printf
-                else
-                        DEFINES   += HAVE_PRINTF PRINTF_S=screen_printf
-                endif
-
-        endif
-else
-        DEFINES   += PRINTF_S\(...\)=
-endif
 
 .PHONY: rust
 rust: