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-rw-r--r--mrbgems/mruby-io/include/mruby/ext/io.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/mrbgems/mruby-io/include/mruby/ext/io.h b/mrbgems/mruby-io/include/mruby/ext/io.h
index da76ac769..dfff8e0e0 100644
--- a/mrbgems/mruby-io/include/mruby/ext/io.h
+++ b/mrbgems/mruby-io/include/mruby/ext/io.h
@@ -18,7 +18,7 @@ extern "C" {
#if defined(MRB_WITHOUT_IO_PREAD_PWRITE)
# undef MRB_WITH_IO_PREAD_PWRITE
#elif !defined(MRB_WITH_IO_PREAD_PWRITE)
-# if defined(__unix__)
+# if defined(__unix__) || defined(__MACH__)
# define MRB_WITH_IO_PREAD_PWRITE
# endif
#endif