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-rw-r--r--scheme-private.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/scheme-private.h b/scheme-private.h
index 093442f..69b78f2 100644
--- a/scheme-private.h
+++ b/scheme-private.h
@@ -200,7 +200,7 @@ unsigned int flags;
void *ext_data; /* For the benefit of foreign functions */
long gensym_cnt;
-struct scheme_interface *vptr;
+const struct scheme_interface *vptr;
};
/* operator code */