diff --git a/src/class_diagram/generators/mermaid/class_diagram_generator.cc b/src/class_diagram/generators/mermaid/class_diagram_generator.cc
index f1cf57fd..0b115042 100644
--- a/src/class_diagram/generators/mermaid/class_diagram_generator.cc
+++ b/src/class_diagram/generators/mermaid/class_diagram_generator.cc
@@ -240,16 +240,16 @@ void generator::generate_method(
 
     std::vector<std::string> method_mods;
     if (m.is_defaulted()) {
-        method_mods.push_back("default");
+        method_mods.emplace_back("default");
     }
     if (m.is_const()) {
-        method_mods.push_back("const");
+        method_mods.emplace_back("const");
     }
     if (m.is_constexpr()) {
-        method_mods.push_back("constexpr");
+        method_mods.emplace_back("constexpr");
     }
     if (m.is_consteval()) {
-        method_mods.push_back("consteval");
+        method_mods.emplace_back("consteval");
     }
 
     if (!method_mods.empty()) {
diff --git a/src/common/generators/mermaid/generator.cc b/src/common/generators/mermaid/generator.cc
index f7b270c4..355995d4 100644
--- a/src/common/generators/mermaid/generator.cc
+++ b/src/common/generators/mermaid/generator.cc
@@ -74,8 +74,8 @@ std::string to_mermaid(message_t r)
 
 std::string indent(const unsigned level)
 {
-    const auto kIndentWidth = 4U;
-    return std::string(level * kIndentWidth, ' ');
+    const auto kIndentWidth = 4UL;
+    return std::string(level * kIndentWidth, ' '); // NOLINT
 }
 
 std::string render_name(std::string name)