diff --git a/radio/src/targets/common/arm/stm32/bootloader/CMakeLists.txt b/radio/src/targets/common/arm/stm32/bootloader/CMakeLists.txt
index c88ac1bb6..770e03d3a 100644
--- a/radio/src/targets/common/arm/stm32/bootloader/CMakeLists.txt
+++ b/radio/src/targets/common/arm/stm32/bootloader/CMakeLists.txt
@@ -113,6 +113,9 @@ remove_definitions(-DUSB_SERIAL)
 add_definitions(-DBOOT)
 
 set(CMAKE_EXE_LINKER_FLAGS "-mcpu=${MCU} -mthumb -nostartfiles -lm -T${RADIO_SRC_DIRECTORY}/targets/${TARGET_DIR}/stm32_ramboot.ld -Wl,-Map=bootloader.map,--cref,--no-warn-mismatch,--gc-sections")
+# use smaller nano libc
+set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} --specs=nano.specs")
+
 
 add_executable(bootloader ${BOOTLOADER_SRC})
 add_dependencies(bootloader ${BITMAPS_TARGET} firmware_translations)