diff --git a/src/newgrf_text.cpp b/src/newgrf_text.cpp
index 1c8bf4fa3747a..c62ce6fbe72d8 100644
--- a/src/newgrf_text.cpp
+++ b/src/newgrf_text.cpp
@@ -825,7 +825,7 @@ void StopTextRefStackUsage()
  * @param modify_parameters When true, modify the OpenTTD string formatting parameters.
  * @return the string control code to "execute" now
  */
-uint RemapNewGRFStringControlCode(uint scc, const char **str, StringParameters &parameters, bool modify_parameters)
+char32_t RemapNewGRFStringControlCode(char32_t scc, const char **str, StringParameters &parameters, bool modify_parameters)
 {
 	switch (scc) {
 		default: break;
diff --git a/src/strings_internal.h b/src/strings_internal.h
index e56f2b8cea97a..b710be23e5423 100644
--- a/src/strings_internal.h
+++ b/src/strings_internal.h
@@ -347,6 +347,6 @@ void GenerateTownNameString(StringBuilder &builder, size_t lang, uint32_t seed);
 void GetTownName(StringBuilder &builder, const struct Town *t);
 void GRFTownNameGenerate(StringBuilder &builder, uint32_t grfid, uint16_t gen, uint32_t seed);
 
-uint RemapNewGRFStringControlCode(uint scc, const char **str, StringParameters &parameters, bool modify_parameters);
+char32_t RemapNewGRFStringControlCode(char32_t scc, const char **str, StringParameters &parameters, bool modify_parameters);
 
 #endif /* STRINGS_INTERNAL_H */