diff --git a/src/strings_func.h b/src/strings_func.h
--- a/src/strings_func.h
+++ b/src/strings_func.h
@@ -14,7 +14,6 @@
 #include "string_type.h"
 #include "gfx_type.h"
 #include "core/bitmath_func.hpp"
-#include "core/span_type.hpp"
 #include "core/strong_typedef_type.hpp"
 #include "vehicle_type.h"
 
@@ -99,7 +98,7 @@ void SetDParamStr(size_t n, const char *
 void SetDParamStr(size_t n, const std::string &str);
 void SetDParamStr(size_t n, std::string &&str);
 
-void CopyInDParam(const span<const StringParameterBackup> backup);
+void CopyInDParam(const std::span<const StringParameterBackup> backup);
 void CopyOutDParam(std::vector<StringParameterBackup> &backup, size_t num);
 bool HaveDParamChanged(const std::vector<StringParameterBackup> &backup);