diff --git a/platform/targets/DM-1801/hwconfig.h b/platform/targets/DM-1801/hwconfig.h
index 0d79bdd1..aea63ff8 100644
--- a/platform/targets/DM-1801/hwconfig.h
+++ b/platform/targets/DM-1801/hwconfig.h
@@ -40,6 +40,9 @@
 /* Screen pixel format */
 #define PIX_FMT_BW
 
+/* Screen has adjustable contrast */
+#define SCREEN_CONTRAST
+
 /* Battery type */
 #define BAT_LIPO_2S
 
diff --git a/platform/targets/MD-9600/hwconfig.h b/platform/targets/MD-9600/hwconfig.h
index a34a0384..55e53eff 100644
--- a/platform/targets/MD-9600/hwconfig.h
+++ b/platform/targets/MD-9600/hwconfig.h
@@ -40,6 +40,9 @@
 #define SCREEN_WIDTH 128
 #define SCREEN_HEIGHT 64
 
+/* Screen has adjustable contrast */
+#define SCREEN_CONTRAST
+
 /* Screen pixel format */
 #define PIX_FMT_BW