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-rw-r--r--include/ruby/util.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/ruby/util.h b/include/ruby/util.h
index f0ea874322..e8727a3200 100644
--- a/include/ruby/util.h
+++ b/include/ruby/util.h
@@ -19,7 +19,7 @@
# include <stddef.h> /* size_t */
#endif
-#if HAVE_SYS_TYPES_H
+#ifdef HAVE_SYS_TYPES_H
# include <sys/types.h> /* ssize_t */
#endif