diff --git a/Source/Windows/Common/CRT/String.cpp b/Source/Windows/Common/CRT/String.cpp
index dab3cb8..ea0e028 100644
--- a/Source/Windows/Common/CRT/String.cpp
+++ b/Source/Windows/Common/CRT/String.cpp
@@ -187,7 +187,7 @@ DLLEXPORT_FUNC(int, _isctype, (int _C, int _Type)) {
   UNIMPLEMENTED();
 }
 
-DLLEXPORT_FUNC(const unsigned short*, __pctype_func, (void)) {
+DLLEXPORT_FUNC(unsigned short*, __pctype_func, (void)) {
   return CTypeData;
 }