diff --git a/win32/include/jpeg/jmorecfg.h b/win32/include/jpeg/jmorecfg.h
index b19fba2a..2407edbe 100644
--- a/win32/include/jpeg/jmorecfg.h
+++ b/win32/include/jpeg/jmorecfg.h
@@ -264,18 +264,6 @@ typedef enum { FALSE = 0, TRUE = 1 } boolean;
 #endif
 
 
-#if _WIN32
-
-#  ifdef FALSE			/* in case these macros already exist */
-#    undef FALSE			/* values of boolean */
-#  endif
-#  ifdef TRUE
-#    undef TRUE	
-#  endif
-
-typedef enum { FALSE = 0, TRUE = 1 } boolean;
-#endif
-
 /*
  * The remaining options affect code selection within the JPEG library,
  * but they don't need to be visible to most applications using the library.