diff --git a/number_theory/test_tools.hpp b/number_theory/test_tools.hpp
index b3bf74b..b3f49ac 100644
--- a/number_theory/test_tools.hpp
+++ b/number_theory/test_tools.hpp
@@ -6,6 +6,7 @@
 
 #include <array>
 #include <cerrno>
+#include <cstdint>
 #include <cstdio>
 #include <cstring>
 #include <stdexcept>
@@ -20,13 +21,13 @@ namespace test_tools_detail {
 
 template <class T>
 [[noreturn]] ATTRIBUTE_COLD inline void throw_impl(const char* message_format, T arg,
-                                                   const char* file_name, uint32_t line,
+                                                   const char* file_name, std::uint32_t line,
                                                    const char* function_name) {
     std::array<char, 1024> buffer{};
-    int bytes_written     = std::snprintf(buffer.data(), buffer.size(),
-                                          "Check failed at %s:%u %s\nError messssage: ", file_name,
-                                          line, function_name);
-    size_t err_msg_offset = uint32_t(bytes_written);
+    int bytes_written   = std::snprintf(buffer.data(), buffer.size(),
+                                        "Check failed at %s:%u %s\nError messssage: ", file_name,
+                                        line, function_name);
+    auto err_msg_offset = static_cast<std::size_t>(static_cast<std::int64_t>(bytes_written));
     if (err_msg_offset > buffer.size()) {
         perror("std::snprintf");
         err_msg_offset = 0;
@@ -105,10 +106,10 @@ struct Wrapper final {
 private:
     [[noreturn]] ATTRIBUTE_COLD static void ThrowOnFOpenFail(const char* fname, const char* mode) {
         std::array<char, 1024> buffer{};
-        int bytes_written = std::snprintf(
-            buffer.data(), buffer.size(),
-            "Wrapper::Wrapper(const char* fname, const char* mode): std::fopen(\"%s\", \"%s\") failed: %s",
-            fname, mode, strerror(errno));
+        int bytes_written = std::snprintf(buffer.data(), buffer.size(),
+                                          "Wrapper::Wrapper(const char* fname, const char* mode): "
+                                          "std::fopen(\"%s\", \"%s\") failed: %s",
+                                          fname, mode, std::strerror(errno));
         if (bytes_written < 0) [[unlikely]] {
             constexpr std::string_view msg =
                 "Wrapper::Wrapper(const char* fname,const char* mode): "