diff --git a/runtime/json.hpp b/runtime/json.hpp
index 7a0eb52..baffd4c 100644
--- a/runtime/json.hpp
+++ b/runtime/json.hpp
@@ -253,7 +253,16 @@ public:
     }
 
 private:
-    inline void step() { this->i += 1; }
+    inline void step()
+    {
+        if (this->cur() == '\n') {
+            this->col = 1;
+            this->line += 1;
+        } else {
+            this->col += 1;
+        }
+        this->i += 1;
+    }
 
     inline auto intern_str(std::string val) -> size_t
     {