1 files changed, 2 insertions, 0 deletions
diff --git a/Compiler.h b/Compiler.h
index 5d5b6d47..1aeaee88 100644
--- a/Compiler.h
+++ b/Compiler.h
@@ -20,6 +20,8 @@
  * Solidity AST to EVM bytecode compiler.
  */
 
+#pragma once
+
 #include <ostream>
 #include <functional>
 #include <libsolidity/ASTVisitor.h>