1 files changed, 2 insertions, 0 deletions

diff --git a/src/pre.l b/src/pre.l
index e89a61c..18cdbc9 100644
--- a/src/pre.l
+++ b/src/pre.l
@@ -15,6 +15,8 @@
  *
  */
 %option never-interactive
+%option prefix="preYY"
+
 %{
 
 /*