diff --git a/src/lexer/lexer.hpp b/src/lexer/lexer.hpp
index 0ee47b5..fe9adeb 100644
--- a/src/lexer/lexer.hpp
+++ b/src/lexer/lexer.hpp
@@ -6,7 +6,7 @@
 namespace lexer {
     struct lexer {
         std::istream& input;
-        char c;
+        char c = 0;
         token::token next_token();
 
       private: