diff --git a/src/Location.cpp b/src/Location.cpp
index 6d88788..13971e0 100644
--- a/src/Location.cpp
+++ b/src/Location.cpp
@@ -12,14 +12,12 @@ Location::~Location()
 
 std::string Location::str() const
 {
-    std::ostringstream ss;
-    ss << fname << ":" << line << ":" << column;
-    return ss.str();
+    return format_string("%s:%d:%d", fname, line, column);
 }
 
 std::string Location::paren_str() const
 {
-    return format_string("(%s)", this->str());
+    return format_string("(%s:%d:%d)", fname, line, column);
 }
 
 void Location::advance()