diff --git a/Include/allobjects.h b/Include/allobjects.h
index 1f81e08..3fe2e83 100644
--- a/Include/allobjects.h
+++ b/Include/allobjects.h
@@ -24,6 +24,10 @@
 
 /* "allobjects.c" -- Source for precompiled header "allobjects.h" */
 
+#ifdef THINK_C
+#define macintosh
+#endif
+
 #include <stdio.h>
 #include <string.h>