diff --git a/src/internal/methods/NeoEsp32I2sXMethod.h b/src/internal/methods/NeoEsp32I2sXMethod.h
index 2a5a91c..a0263b5 100644
--- a/src/internal/methods/NeoEsp32I2sXMethod.h
+++ b/src/internal/methods/NeoEsp32I2sXMethod.h
@@ -469,7 +469,7 @@ public:
         }
     }
 
-    bool IsWriteDone()
+    bool IsWriteDone() const
     {
         return i2sWriteDone(T_BUS::I2sBusNumber);
     }