diff --git a/tools/libxc/xc_hcall_buf.c b/tools/libxc/xc_hcall_buf.c
index 6e3c958df8..4f4444cbfc 100644
--- a/tools/libxc/xc_hcall_buf.c
+++ b/tools/libxc/xc_hcall_buf.c
@@ -198,7 +198,7 @@ int xc__hypercall_bounce_pre(xc_interface *xch, xc_hypercall_buffer_t *b)
         abort();
 
     /*
-     * Do need to bounce a NULL buffer.
+     * Don't need to bounce a NULL buffer.
      */
     if ( b->ubuf == NULL )
     {