diff --git a/libraries/Arduino_LED_Matrix/src/Arduino_LED_Matrix.h b/libraries/Arduino_LED_Matrix/src/Arduino_LED_Matrix.h
index 437b52f9..7fa84e15 100644
--- a/libraries/Arduino_LED_Matrix/src/Arduino_LED_Matrix.h
+++ b/libraries/Arduino_LED_Matrix/src/Arduino_LED_Matrix.h
@@ -7,7 +7,7 @@ void matrixEnd(void);
 void matrixPlay(uint8_t *buf, uint32_t len);
 void matrixSetGrayscaleBits(uint8_t _max);
 void matrixGrayscaleWrite(uint8_t *buf);
-void matrixWrite(uint32_t *buf);
+void matrixWrite(const uint32_t *buf);
 };
 
 #if __has_include("ArduinoGraphics.h")