diff --git a/Source/Core/Common/StringUtil.h b/Source/Core/Common/StringUtil.h
index b18a25dd13..262af614b7 100644
--- a/Source/Core/Common/StringUtil.h
+++ b/Source/Core/Common/StringUtil.h
@@ -211,25 +211,6 @@ inline std::string UTF8ToTStr(std::string_view str)
 std::filesystem::path StringToPath(std::string_view path);
 std::string PathToString(const std::filesystem::path& path);
 
-// Thousand separator. Turns 12345678 into 12,345,678
-template <typename I>
-std::string ThousandSeparate(I value, int spaces = 0)
-{
-#ifdef _WIN32
-  std::wostringstream stream;
-#else
-  std::ostringstream stream;
-#endif
-
-  stream << std::setw(spaces) << value;
-
-#ifdef _WIN32
-  return WStringToUTF8(stream.str());
-#else
-  return stream.str();
-#endif
-}
-
 namespace Common
 {
 /// Returns whether a character is printable, i.e. whether 0x20 <= c <= 0x7e is true.
@@ -258,6 +239,25 @@ inline char ToUpper(char ch)
   return std::toupper(ch, std::locale::classic());
 }
 
+// Thousand separator. Turns 12345678 into 12,345,678
+template <typename I>
+std::string ThousandSeparate(I value, int spaces = 0)
+{
+#ifdef _WIN32
+  std::wostringstream stream;
+#else
+  std::ostringstream stream;
+#endif
+
+  stream << std::setw(spaces) << value;
+
+#ifdef _WIN32
+  return WStringToUTF8(stream.str());
+#else
+  return stream.str();
+#endif
+}
+
 #ifdef _WIN32
 std::vector<std::string> CommandLineToUtf8Argv(const wchar_t* command_line);
 #endif
diff --git a/Source/Core/Core/HW/DVD/FileMonitor.cpp b/Source/Core/Core/HW/DVD/FileMonitor.cpp
index 6e08006a6a..f4bc53a097 100644
--- a/Source/Core/Core/HW/DVD/FileMonitor.cpp
+++ b/Source/Core/Core/HW/DVD/FileMonitor.cpp
@@ -77,7 +77,7 @@ void FileLogger::Log(const DiscIO::Volume& volume, const DiscIO::Partition& part
   if (m_previous_partition == partition && m_previous_file_offset == file_offset)
     return;
 
-  const std::string size_string = ThousandSeparate(file_info->GetSize() / 1000, 7);
+  const std::string size_string = Common::ThousandSeparate(file_info->GetSize() / 1000, 7);
   const std::string path = file_info->GetPath();
   const std::string log_string = fmt::format("{} kB {}", size_string, path);
   if (IsSoundFile(path))