diff --git a/src/plugins/Display/Display_Mono.h b/src/plugins/Display/Display_Mono.h
index 42eea5f3..4739f83f 100644
--- a/src/plugins/Display/Display_Mono.h
+++ b/src/plugins/Display/Display_Mono.h
@@ -23,7 +23,7 @@ class DisplayMono {
 
       virtual void init(uint8_t type, uint8_t rot, uint8_t cs, uint8_t dc, uint8_t reset, uint8_t clock, uint8_t data, uint32_t* utcTs, const char* version) = 0;
       virtual void config(bool enPowerSafe, bool enScreenSaver, uint8_t lum) = 0;
-      virtual void loop(void) = 0;
+      virtual void loop(uint8_t lum) = 0;
       virtual void disp(float totalPower, float totalYieldDay, float totalYieldTotal, uint8_t isprod) = 0;
 
    protected: