diff --git a/src/UCI.hpp.in b/src/UCI.hpp.in
index 8e97bbe..67cabcf 100644
--- a/src/UCI.hpp.in
+++ b/src/UCI.hpp.in
@@ -1,3 +1,5 @@
+#pragma once
+
 #ifndef @COMPILE_PLATFORM@
 #define @COMPILE_PLATFORM@
 #endif