diff --git a/stm-firmware/Makefile b/stm-firmware/Makefile
index 3bc8a31..e764476 100644
--- a/stm-firmware/Makefile
+++ b/stm-firmware/Makefile
@@ -54,7 +54,7 @@ LFLAGS += -Tstm32f407vet6_flash.ld -Wl,-Map=$(mapfile).map
 
 CFLAGS = -c -fmessage-length=0 -mlittle-endian -mthumb -mcpu=cortex-m4 -mthumb-interwork
 CFLAGS += -mfloat-abi=hard -mfpu=fpv4-sp-d16 -nostartfiles -O0 -g
-
+CFLAGS += -Wall -Wextra -Wold-style-declaration -Wuninitialized -Wmaybe-uninitialized -Wunused-parameter
 ####################################################################################
 
 OBJ = $(CFILES:%.c=$(OBJDIR)/%.c.o)
diff --git a/stm-firmware/shell.c b/stm-firmware/shell.c
index b3dfea9..2c914c5 100644
--- a/stm-firmware/shell.c
+++ b/stm-firmware/shell.c
@@ -121,6 +121,7 @@ static shellmatta_retCode_t shell_cmd_clear_error_status(const shellmatta_handle
 {
 	(void)arguments;
 	(void)length;
+	(void)handle;
 
 	adc_pt1000_clear_error();
 
@@ -133,6 +134,7 @@ static shellmatta_retCode_t shell_cmd_uptime(const shellmatta_handle_t   handle,
 {
 	(void)arguments;
 	(void)length;
+
 	shellmatta_printf(handle, "Uptime: %llu secs", global_tick_ms/1000);
 	return SHELLMATTA_OK;
 }