diff --git a/auto/src/glew_pre.h b/auto/src/glew_pre.h
index 3574c96..5820ae5 100644
--- a/auto/src/glew_pre.h
+++ b/auto/src/glew_pre.h
@@ -119,9 +119,10 @@
 #endif
 /* <ctype.h> */
 #if !defined(__CYGWIN__) && !defined(__MINGW32__) && !defined(_WCHAR_T_DEFINED)
-#ifndef _WCHAR_T_DEFINED
-typedef unsigned short wchar_t;
-#define _WCHAR_T_DEFINED
+#  ifndef _WCHAR_T_DEFINED
+     typedef unsigned short wchar_t;
+#    define _WCHAR_T_DEFINED
+#  endif
 #endif
 
 #ifndef GLAPI