diff --git a/include/Parsodus/grammar.h b/include/Parsodus/grammar.h
index 23dd707..018e974 100644
--- a/include/Parsodus/grammar.h
+++ b/include/Parsodus/grammar.h
@@ -35,11 +35,11 @@ namespace pds {
             }
         }
 
-        Rule() : head(""), tail(), name("") {}
-        Rule(const std::string& h, const std::vector<std::string>& t) : head(h), tail(t), name("") {}
-        Rule(const std::string& h, const std::vector<std::string>& t, const std::string& name) : head(h), tail(t), name(name) {}
-        Rule(const std::string& h, const std::vector<std::string>& t, const std::string& name, std::pair<bool, std::pair<int, PrecedenceType>> precedence) : 
-            head(h), tail(t), name(name), precedence(precedence) {}
+        Rule() : Rule("", {}, ""){}
+        Rule(const std::string& h, const std::vector<std::string>& t) : Rule(h, t, "") {}
+        Rule(const std::string& h, const std::vector<std::string>& t, const std::string& name) : head(h), tail(t), name(name), precedence{false, {0, PrecedenceType::RIGHT}} {}
+        Rule(const std::string& h, const std::vector<std::string>& t, const std::string& name, std::pair<int, PrecedenceType> precedence) : 
+            head(h), tail(t), name(name), precedence{true, precedence} {}
     };
 
     /**
@@ -56,7 +56,7 @@ namespace pds {
         std::unique_ptr<util::FirstSet> first;
         std::unique_ptr<util::FollowSet> follow;
 
-        Grammar() : start(""), variables(), terminals(), rules(), first(nullptr), follow(nullptr)
+        Grammar() : start(""), variables(), terminals(), rules(), precedence(), first(nullptr), follow(nullptr)
         {}
 
         Grammar(const Grammar& rhs)