diff --git a/src/tftespiimpl.h b/src/tftespiimpl.h
index f22f505..5150a49 100644
--- a/src/tftespiimpl.h
+++ b/src/tftespiimpl.h
@@ -77,7 +77,7 @@ public:
     uint16_t decodeUTF8(uint8_t c) override { return m_tft.decodeUTF8(c); }
 
     void    setSwapBytes(bool swap) override { m_tft.setSwapBytes(swap); }
-    bool    getSwapBytes(void) const override { return m_tft.getSwapBytes(); }
+    bool    getSwapBytes(void) override { return m_tft.getSwapBytes(); }
 
     void     startWrite(void) override { m_tft.startWrite(); }
     void     writeColor(uint16_t color, uint32_t len) override { m_tft.writeColor(color, len); }
diff --git a/src/tftinterface.h b/src/tftinterface.h
index 2a1d756..6955711 100644
--- a/src/tftinterface.h
+++ b/src/tftinterface.h
@@ -91,7 +91,7 @@ public:
 
     // Swap the byte order for pushImage() and pushPixels() - corrects endianness
     virtual void     setSwapBytes(bool swap) = 0;
-    virtual bool     getSwapBytes(void) const = 0;
+    virtual bool     getSwapBytes(void) = 0;
 
     // Bare metal functions
     virtual void     startWrite(void) = 0;