diff --git a/src/ints/int10.cpp b/src/ints/int10.cpp
index 6bcc2302..0e5bc636 100644
--- a/src/ints/int10.cpp
+++ b/src/ints/int10.cpp
@@ -437,7 +437,7 @@ static void SetupTandyBios(void) {
 		0x64, 0x2e, 0x0d, 0x0a, 0x61, 0x6e, 0x64, 0x20, 0x54, 0x61, 0x6e, 0x64, 0x79
 	};
 	Bitu i;
-	real_writeb(0xffff,0xe,0xff);
+	phys_writeb(0xffffe,0xff);
 	for(i=0;i<130;i++) {
 		phys_writeb(0xf0000+i+0xc000, TandyConfig[i]);
 	}