diff --git a/Marlin/src/lcd/dwin/e3v2/dwin.h b/Marlin/src/lcd/dwin/e3v2/dwin.h
index 80bc93dcc5..5656d67e9a 100644
--- a/Marlin/src/lcd/dwin/e3v2/dwin.h
+++ b/Marlin/src/lcd/dwin/e3v2/dwin.h
@@ -249,8 +249,7 @@ typedef struct {
     float Move_E_scale    = 0;
   #endif
   float offset_value      = 0;
-  TERN_(__STM32F1__, signed)
-  char show_mode          = 0; // -1: Temperature control    0: Printing temperature
+  int8_t show_mode        = 0; // -1: Temperature control    0: Printing temperature
 } HMI_value_t;
 
 #define DWIN_CHINESE 123