diff --git a/hw/xfree86/common/xisb.c b/hw/xfree86/common/xisb.c
index ae029f3cb..0efbe2ab2 100644
--- a/hw/xfree86/common/xisb.c
+++ b/hw/xfree86/common/xisb.c
@@ -129,13 +129,6 @@ XisbRead(XISBuffer * b)
     return b->buf[b->current++];
 }
 
-/* turn tracing of this buffer on (1) or off (0) */
-void
-XisbTrace(XISBuffer * b, int trace)
-{
-    b->trace = trace;
-}
-
 /*
  * specify a block_duration of -1 when you know the buffer's fd is ready to
  * read. After a read, it is automatically set to 0 so that the next read
diff --git a/hw/xfree86/common/xisb.h b/hw/xfree86/common/xisb.h
index e1ef1f70f..c719c964a 100644
--- a/hw/xfree86/common/xisb.h
+++ b/hw/xfree86/common/xisb.h
@@ -54,7 +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 void XisbTrace(XISBuffer * b, int trace);
 extern _X_EXPORT void XisbBlockDuration(XISBuffer * b, int block_duration);
 
 /*