diff --git a/platform.txt b/platform.txt
index 2392730..2920a9b 100644
--- a/platform.txt
+++ b/platform.txt
@@ -34,8 +34,8 @@ compiler.optimization_flags.debug=-Og -g3
 
 compiler.extra_flags = -march=rv32imc_zicsr_zifencei -mabi=ilp32 -mcmodel=medlow -Wall -fsigned-char -ffunction-sections
 compiler.S.flags     = {compiler.extra_flags} -x assembler-with-cpp {compiler.define} -I"{runtime.platform.path}/libraries/FreeRTOS/src" {compiler.optimization_flags} {compiler.warning_flags} {compiler.MIK32_Amur.extra_include}
-compiler.c.flags     = -c -std=gnu11 {compiler.extra_flags} {compiler.define} {compiler.warning_flags} {compiler.optimization_flags} {compiler.MIK32_Amur.extra_include}
-compiler.cpp.flags   = -c -std=gnu++17 -fabi-version=0 -fno-exceptions -fno-rtti -fno-use-cxa-atexit -fno-threadsafe-statics {compiler.extra_flags} {compiler.define} {compiler.warning_flags} {compiler.optimization_flags} {compiler.MIK32_Amur.extra_include}
+compiler.c.flags     = -c -std=gnu11 -Werror=return-type {compiler.extra_flags} {compiler.define} {compiler.warning_flags} {compiler.optimization_flags} {compiler.MIK32_Amur.extra_include}
+compiler.cpp.flags   = -c -std=gnu++17 -fabi-version=0 -fno-exceptions -fno-rtti -fno-use-cxa-atexit -fno-threadsafe-statics -Werror=return-type {compiler.extra_flags} {compiler.define} {compiler.warning_flags} {compiler.optimization_flags} {compiler.MIK32_Amur.extra_include}
 compiler.c.elf.flags = -march=rv32imc_zicsr_zifencei -mabi=ilp32 -mcmodel=medlow -nostartfiles -Xlinker
 compiler.ar.flags=rc
 compiler.elf2bin.flags=-O binary