diff --git a/dlls/user/property.c b/dlls/user/property.c
index 6e9fa93b9ef..fac119b3394 100644
--- a/dlls/user/property.c
+++ b/dlls/user/property.c
@@ -76,7 +76,7 @@ static property_data_t *get_properties( HWND hwnd, int *count )
  *
  * relay to call the EnumProps callback function from EnumPropsEx
  */
-static BOOL CALLBACK EnumPropsA_relay( HWND hwnd, LPCSTR str, HANDLE handle, ULONG_PTR lparam )
+static BOOL CALLBACK EnumPropsA_relay( HWND hwnd, LPSTR str, HANDLE handle, ULONG_PTR lparam )
 {
     PROPENUMPROCA func = (PROPENUMPROCA)lparam;
     return func( hwnd, str, handle );
@@ -88,7 +88,7 @@ static BOOL CALLBACK EnumPropsA_relay( HWND hwnd, LPCSTR str, HANDLE handle, ULO
  *
  * relay to call the EnumProps callback function from EnumPropsEx
  */
-static BOOL CALLBACK EnumPropsW_relay( HWND hwnd, LPCWSTR str, HANDLE handle, ULONG_PTR lparam )
+static BOOL CALLBACK EnumPropsW_relay( HWND hwnd, LPWSTR str, HANDLE handle, ULONG_PTR lparam )
 {
     PROPENUMPROCW func = (PROPENUMPROCW)lparam;
     return func( hwnd, str, handle );
diff --git a/include/winuser.h b/include/winuser.h
index b9962e3e153..14d36e50774 100644
--- a/include/winuser.h
+++ b/include/winuser.h
@@ -46,8 +46,8 @@ typedef BOOL    (CALLBACK *NAMEENUMPROCA)(LPSTR,LPARAM);
 typedef BOOL    (CALLBACK *NAMEENUMPROCW)(LPWSTR,LPARAM);
 typedef BOOL    (CALLBACK *PROPENUMPROCA)(HWND,LPCSTR,HANDLE);
 typedef BOOL    (CALLBACK *PROPENUMPROCW)(HWND,LPCWSTR,HANDLE);
-typedef BOOL    (CALLBACK *PROPENUMPROCEXA)(HWND,LPCSTR,HANDLE,ULONG_PTR);
-typedef BOOL    (CALLBACK *PROPENUMPROCEXW)(HWND,LPCWSTR,HANDLE,ULONG_PTR);
+typedef BOOL    (CALLBACK *PROPENUMPROCEXA)(HWND,LPSTR,HANDLE,ULONG_PTR);
+typedef BOOL    (CALLBACK *PROPENUMPROCEXW)(HWND,LPWSTR,HANDLE,ULONG_PTR);
 typedef VOID    (CALLBACK *SENDASYNCPROC)(HWND,UINT,ULONG_PTR,LRESULT);
 typedef VOID    (CALLBACK *TIMERPROC)(HWND,UINT,UINT_PTR,DWORD);
 typedef VOID    (CALLBACK *WINEVENTPROC)(HWINEVENTHOOK,DWORD,HWND,LONG,LONG,