diff --git a/src/common/clang_utils.cc b/src/common/clang_utils.cc
index 7f5d06b3..85fee0aa 100644
--- a/src/common/clang_utils.cc
+++ b/src/common/clang_utils.cc
@@ -417,7 +417,8 @@ bool is_subexpr_of(const clang::Stmt *parent_stmt, const clang::Stmt *sub_stmt)
 
 template <> eid_t to_id(const std::string &full_name)
 {
-    return static_cast<eid_t>(std::hash<std::string>{}(full_name));
+    return static_cast<eid_t>(
+        static_cast<uint64_t>(std::hash<std::string>{}(full_name)));
 }
 
 eid_t to_id(const clang::QualType &type, const clang::ASTContext &ctx)
diff --git a/src/common/types.h b/src/common/types.h
index d1a250e9..53c203e8 100644
--- a/src/common/types.h
+++ b/src/common/types.h
@@ -349,6 +349,6 @@ public:
     template <typename Context>
     constexpr auto format(clanguml::common::eid_t const &id, Context &ctx) const
     {
-        return format_to(ctx.out(), "{}", id.value());
+        return fmt::format_to(ctx.out(), "{}", id.value());
     }
-};
\ No newline at end of file
+};