diff --git a/.gitea/workflows/sdcc.yml b/.gitea/workflows/sdcc.yml
index b093e2b..6af4877 100644
--- a/.gitea/workflows/sdcc.yml
+++ b/.gitea/workflows/sdcc.yml
@@ -56,7 +56,7 @@ jobs:
           # Set CFLAGS to disable treating warnings as errors
           export CFLAGS="$CFLAGS -Wno-error"
           # ./configure --target=8051 --with-arch=8051 --prefix=/usr/local
-          ./configure --disable-gbz80-port --disable-z80-port --disable-ds390-port --disable-ds400-port --disable-pic14-port --disable-pic16-port --disable-hc08-port --disable-r2k-port --disable-z180-port --disable-sdcdb --disable-ucsim --prefix=/usr/local
+          ./configure --disable-gbz80-port --disable-z80-port --disable-ds390-port --disable-ds400-port --disable-pic14-port --disable-pic16-port --disable-hc08-port --disable-r2k-port --disable-z180-port --disable-sdcdb --disable-ucsim --target=8051 --with-arch=8051 --prefix=/usr/local
 
           make
           sudo make install
diff --git a/Makefile b/Makefile
index fc251e7..296e371 100644
--- a/Makefile
+++ b/Makefile
@@ -8,7 +8,7 @@ INCLUDE_DIRS = -I$(ZSTACK_DIR)
 
 # Compiler settings
 CC = sdcc	# sdcc compiler
-CFLAGS = -mmc51 $(INCLUDE_DIRS)  # add include paths to compiler flags
+CFLAGS = -mcs51 $(INCLUDE_DIRS)  # add include paths to compiler flags
 
 SRC=$(wildcard *.c)
 HEADERS = main.h zigbee_comm.h sensors/bme280.h sensors/wind_vane.h sensors/rain_gauge.h sensors/anemometer.h config.h include/hal_types.h include/hal_defs.h include/hal_timer.h include/ZComDef.h include/OSAL.h include/i2c.h