diff --git a/xen/common/debugtrace.c b/xen/common/debugtrace.c
index 7313e89389..a788e55b4c 100644
--- a/xen/common/debugtrace.c
+++ b/xen/common/debugtrace.c
@@ -259,7 +259,6 @@ static void debugtrace_alloc_buffer(struct debugtrace_data **ptr,
 
     memset(data, '\0', debugtrace_bytes + sizeof(*data));
 
-    dt_data = data;
     *ptr = data;
 }