diff --git a/moses/src/TreeInput.h b/moses/src/TreeInput.h
index ea5483b42..836d741f5 100644
--- a/moses/src/TreeInput.h
+++ b/moses/src/TreeInput.h
@@ -2,8 +2,6 @@
 #define moses_TreeInput_h
 
 
-#pragma once
-
 #include <vector>
 #include "Sentence.h"