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-rw-r--r--include/ruby/ruby.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/ruby/ruby.h b/include/ruby/ruby.h
index b144fa0111..2f9855e41e 100644
--- a/include/ruby/ruby.h
+++ b/include/ruby/ruby.h
@@ -2855,7 +2855,7 @@ RB_METHOD_DEFINITION_DECL(rb_define_global_function, (1,2), (const char *name),
#endif
-#if !defined(__cplusplus) || defined(RB_METHOD_DEFINITION_DECL)
+#if defined(RUBY_DEVEL) && RUBY_DEVEL && (!defined(__cplusplus) || defined(RB_METHOD_DEFINITION_DECL))
# define RUBY_METHOD_FUNC(func) (func)
#else
# define RUBY_METHOD_FUNC(func) ((VALUE (*)(ANYARGS))(func))