diff --git a/src/openrct2/core/String.cpp b/src/openrct2/core/String.cpp
index 907623b806..ccdd7d0fbf 100644
--- a/src/openrct2/core/String.cpp
+++ b/src/openrct2/core/String.cpp
@@ -403,23 +403,6 @@ namespace String
         return buffer;
     }
 
-    utf8* Duplicate(const std::string& src)
-    {
-        return String::Duplicate(src.c_str());
-    }
-
-    utf8* Duplicate(const utf8* src)
-    {
-        utf8* result = nullptr;
-        if (src != nullptr)
-        {
-            size_t srcSize = SizeOf(src) + 1;
-            result = Memory::Allocate<utf8>(srcSize);
-            std::memcpy(result, src, srcSize);
-        }
-        return result;
-    }
-
     std::vector<std::string> Split(std::string_view s, std::string_view delimiter)
     {
         if (delimiter.empty())
diff --git a/src/openrct2/core/String.hpp b/src/openrct2/core/String.hpp
index 14b2e20815..49389b0804 100644
--- a/src/openrct2/core/String.hpp
+++ b/src/openrct2/core/String.hpp
@@ -82,8 +82,6 @@ namespace String
     u8string StdFormat(const utf8* format, ...);
     u8string Format_VA(const utf8* format, va_list args);
     utf8* AppendFormat(utf8* buffer, size_t bufferSize, const utf8* format, ...);
-    utf8* Duplicate(const std::string& src);
-    utf8* Duplicate(const utf8* src);
 
     /**
      * Splits the given string by a delimiter and returns the values as a new string array.