diff --git a/src/class_diagram/model/class_element.h b/src/class_diagram/model/class_element.h
index afe1b696..7f741f56 100644
--- a/src/class_diagram/model/class_element.h
+++ b/src/class_diagram/model/class_element.h
@@ -18,7 +18,6 @@
 #pragma once
 
 #include "decorated_element.h"
-#include "enums.h"
 
 #include <string>
 
diff --git a/src/class_diagram/model/class_member.h b/src/class_diagram/model/class_member.h
index 8e4206c0..f04cbdf3 100644
--- a/src/class_diagram/model/class_member.h
+++ b/src/class_diagram/model/class_member.h
@@ -18,7 +18,6 @@
 #pragma once
 
 #include "class_element.h"
-#include "enums.h"
 
 #include <string>
 
diff --git a/src/class_diagram/model/class_method.h b/src/class_diagram/model/class_method.h
index f09a270a..98a829ce 100644
--- a/src/class_diagram/model/class_method.h
+++ b/src/class_diagram/model/class_method.h
@@ -18,7 +18,6 @@
 #pragma once
 
 #include "class_element.h"
-#include "enums.h"
 #include "method_parameter.h"
 
 #include <string>
diff --git a/src/class_diagram/model/class_relationship.h b/src/class_diagram/model/class_relationship.h
index 9e89f62f..dd364c85 100644
--- a/src/class_diagram/model/class_relationship.h
+++ b/src/class_diagram/model/class_relationship.h
@@ -18,7 +18,6 @@
 #pragma once
 
 #include "decorated_element.h"
-#include "enums.h"
 #include "stylable_element.h"
 
 #include <string>
diff --git a/src/class_diagram/model/element.h b/src/class_diagram/model/element.h
index b357e407..092feed2 100644
--- a/src/class_diagram/model/element.h
+++ b/src/class_diagram/model/element.h
@@ -19,7 +19,6 @@
 
 #include "class_relationship.h"
 #include "decorated_element.h"
-#include "enums.h"
 
 #include <atomic>
 #include <string>
diff --git a/src/class_diagram/model/method_parameter.cc b/src/class_diagram/model/method_parameter.cc
index e0a70471..6a7cc32f 100644
--- a/src/class_diagram/model/method_parameter.cc
+++ b/src/class_diagram/model/method_parameter.cc
@@ -20,8 +20,6 @@
 
 #include "util/util.h"
 
-#include <spdlog/spdlog.h>
-
 namespace clanguml::class_diagram::model {
 
 void method_parameter::set_type(const std::string &type) { type_ = type; }
@@ -45,9 +43,9 @@ std::string method_parameter::to_string(
     using namespace clanguml::util;
     auto t = ns_relative(using_namespaces, type());
     if (default_value().empty())
-        return fmt::format("{} {}", t, name());
+        return t + " " + name();
 
-    return fmt::format("{} {} = {}", t, name(), default_value());
+    return t + " " + name() + " = " + default_value();
 }
 
 }
diff --git a/src/class_diagram/model/method_parameter.h b/src/class_diagram/model/method_parameter.h
index ef7ab9d2..5b5cab0d 100644
--- a/src/class_diagram/model/method_parameter.h
+++ b/src/class_diagram/model/method_parameter.h
@@ -18,7 +18,6 @@
 #pragma once
 
 #include "decorated_element.h"
-#include "enums.h"
 
 #include <string>
 #include <vector>