diff --git a/hw/display/sm501.c b/hw/display/sm501.c
index 874260a143..4a8686f0f5 100644
--- a/hw/display/sm501.c
+++ b/hw/display/sm501.c
@@ -39,6 +39,7 @@
 #include "hw/i2c/i2c-ddc.h"
 #include "qemu/range.h"
 #include "ui/pixel_ops.h"
+#include "qemu/bswap.h"
 
 /*
  * Status: 2010/05/07
@@ -812,9 +813,11 @@ static void sm501_2d_operation(SM501State *s)
             FILL_RECT(1, uint8_t);
             break;
         case 1:
+            color = cpu_to_le16(color);
             FILL_RECT(2, uint16_t);
             break;
         case 2:
+            color = cpu_to_le32(color);
             FILL_RECT(4, uint32_t);
             break;
         }