diff --git a/Include/pgenheaders.h b/Include/pgenheaders.h
index 8a0b079..adfae68 100644
--- a/Include/pgenheaders.h
+++ b/Include/pgenheaders.h
@@ -28,17 +28,12 @@
 
 ******************************************************************/
 
-/* Include files and extern declarations used by most of the parser.
-   This is a precompiled header for THINK C. */
+/* Include files and extern declarations used by most of the parser. */
 
 #ifdef HAVE_CONFIG_H
 #include "config.h"
 #endif
 
-#ifdef THINK_C
-#define macintosh
-#endif
-
 #include <stdio.h>
 #include <string.h>