1 files changed, 1 insertions, 1 deletions
diff --git a/src/tree.h b/src/tree.h
index 0db1404..31d661c 100644
--- a/src/tree.h
+++ b/src/tree.h
@@ -13,7 +13,7 @@ typedef std::vector<std::unique_ptr<Node>> NodeCollection;
 
 class Tree {
 	public:
-		Tree(std::string);
+		explicit Tree(std::string);
 		Tree(std::string, const ConstantMap*);
 
 		double solve();