diff --git a/Marlin/src/lcd/extui/lib/Creality/Creality_DWIN.h b/Marlin/src/lcd/extui/lib/Creality/Creality_DWIN.h
index c38184952c..fe48b52760 100644
--- a/Marlin/src/lcd/extui/lib/Creality/Creality_DWIN.h
+++ b/Marlin/src/lcd/extui/lib/Creality/Creality_DWIN.h
@@ -114,6 +114,8 @@ namespace ExtUI {
   #define DWIN_SERIAL DGUS_SERIAL
 #elif defined(TARGET_STM32F4)
   #define DWIN_SERIAL Serial1
+#elif defined(__STM32F1__)
+  #define DWIN_SERIAL MSerial3
 #else
   #define DWIN_SERIAL Serial2
 #endif
diff --git a/platformio.ini b/platformio.ini
index 4b558301fa..aecf76dd6f 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -2353,7 +2353,7 @@ platform        = ${common_stm32f1.platform}
 extends         = common_stm32f1
 board           = genericSTM32F103RC
 build_flags     = !python Marlin/src/HAL/STM32F1/build_flags.py
-  ${common.build_flags} -std=gnu++14 -DSTM32_XL_DENSITY -DTEMP_TIMER_CHAN=4 -DMachineEnder3 -DMachineEnder3Pro422
+  ${common.build_flags} -std=gnu++14 -DSTM32_XL_DENSITY -DTEMP_TIMER_CHAN=4 -DMachineEnder3Pro422
 extra_scripts   = ${common.extra_scripts}
   pre:buildroot/share/PlatformIO/scripts/random-bin.py
   buildroot/share/PlatformIO/scripts/creality.py
@@ -2367,7 +2367,7 @@ platform        = ${common_stm32f1.platform}
 extends         = common_stm32f1
 board           = genericSTM32F103RC
 build_flags     = !python Marlin/src/HAL/STM32F1/build_flags.py
-  ${common.build_flags} -std=gnu++14 -DSTM32_XL_DENSITY -DTEMP_TIMER_CHAN=4 -DMachineEnder3 -DMachineEnder3Pro422 -DABL_BLTOUCH
+  ${common.build_flags} -std=gnu++14 -DSTM32_XL_DENSITY -DTEMP_TIMER_CHAN=4 -DMachineEnder3Pro422 -DABL_BLTOUCH
 extra_scripts   = ${common.extra_scripts}
   pre:buildroot/share/PlatformIO/scripts/random-bin.py
   buildroot/share/PlatformIO/scripts/creality.py
@@ -2381,7 +2381,7 @@ platform        = ${common_stm32f1.platform}
 extends         = common_stm32f1
 board           = genericSTM32F103RC
 build_flags     = !python Marlin/src/HAL/STM32F1/build_flags.py
-  ${common.build_flags} -std=gnu++14 -DSTM32_XL_DENSITY -DTEMP_TIMER_CHAN=4 -DMachineEnder3 -DMachineEnder3Pro427
+  ${common.build_flags} -std=gnu++14 -DSTM32_XL_DENSITY -DTEMP_TIMER_CHAN=4 -DMachineEnder3Pro427
 extra_scripts   = ${common.extra_scripts}
   pre:buildroot/share/PlatformIO/scripts/random-bin.py
   buildroot/share/PlatformIO/scripts/creality.py
@@ -2395,7 +2395,7 @@ platform        = ${common_stm32f1.platform}
 extends         = common_stm32f1
 board           = genericSTM32F103RC
 build_flags     = !python Marlin/src/HAL/STM32F1/build_flags.py
-  ${common.build_flags} -std=gnu++14 -DSTM32_XL_DENSITY -DTEMP_TIMER_CHAN=4 -DMachineEnder3 -DMachineEnder3Pro427 -DABL_BLTOUCH
+  ${common.build_flags} -std=gnu++14 -DSTM32_XL_DENSITY -DTEMP_TIMER_CHAN=4 -DMachineEnder3Pro427 -DABL_BLTOUCH
 extra_scripts   = ${common.extra_scripts}
   pre:buildroot/share/PlatformIO/scripts/random-bin.py
   buildroot/share/PlatformIO/scripts/creality.py