diff --git a/include/sqltypes.h b/include/sqltypes.h
index bb2dd4a65d4..2b40878391a 100644
--- a/include/sqltypes.h
+++ b/include/sqltypes.h
@@ -28,6 +28,16 @@ extern "C" {
 #endif
 
 typedef unsigned char   SQLCHAR;
+#ifdef WINE_UNICODE_NATIVE
+typedef wchar_t         SQLWCHAR;
+#else
+typedef unsigned short  SQLWCHAR;
+#endif
+#ifndef UNICODE
+typedef SQLCHAR         SQLTCHAR;
+#else
+typedef SQLWCHAR        SQLTCHAR;
+#endif
 
 #if (ODBCVER >= 0x0300)
 typedef unsigned char   SQLDATE;