diff --git a/hw/xfree86/common/xisb.c b/hw/xfree86/common/xisb.c
index f35a6825a..ae029f3cb 100644
--- a/hw/xfree86/common/xisb.c
+++ b/hw/xfree86/common/xisb.c
@@ -129,19 +129,6 @@ XisbRead(XISBuffer * b)
     return b->buf[b->current++];
 }
 
-/* the only purpose of this function is to provide output tracing */
-ssize_t
-XisbWrite(XISBuffer * b, unsigned char *msg, ssize_t len)
-{
-    if (b->trace) {
-        int i = 0;
-
-        for (i = 0; i < len; i++)
-            ErrorF("\t\twrote 0x%02x (%c)\n", msg[i], msg[i]);
-    }
-    return (xf86WriteSerial(b->fd, msg, len));
-}
-
 /* turn tracing of this buffer on (1) or off (0) */
 void
 XisbTrace(XISBuffer * b, int trace)
diff --git a/hw/xfree86/common/xisb.h b/hw/xfree86/common/xisb.h
index 6ac1a6e37..e1ef1f70f 100644
--- a/hw/xfree86/common/xisb.h
+++ b/hw/xfree86/common/xisb.h
@@ -54,8 +54,6 @@ typedef struct _XISBuffer {
 extern _X_EXPORT XISBuffer *XisbNew(int fd, ssize_t size);
 extern _X_EXPORT void XisbFree(XISBuffer * b);
 extern _X_EXPORT int XisbRead(XISBuffer * b);
-extern _X_EXPORT ssize_t XisbWrite(XISBuffer * b, unsigned char *msg,
-                                   ssize_t len);
 extern _X_EXPORT void XisbTrace(XISBuffer * b, int trace);
 extern _X_EXPORT void XisbBlockDuration(XISBuffer * b, int block_duration);