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-rw-r--r--include/ruby/ruby.h4
1 files changed, 2 insertions, 2 deletions
diff --git a/include/ruby/ruby.h b/include/ruby/ruby.h
index 307bd1c820..db6f98023a 100644
--- a/include/ruby/ruby.h
+++ b/include/ruby/ruby.h
@@ -778,8 +778,8 @@ VALUE rb_id2str(ID);
rb_intern(str))
#endif
-char *rb_class2name(VALUE);
-char *rb_obj_classname(VALUE);
+const char *rb_class2name(VALUE);
+const char *rb_obj_classname(VALUE);
void rb_p(VALUE);