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-rw-r--r--ext/socket/rubysocket.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/ext/socket/rubysocket.h b/ext/socket/rubysocket.h
index 3e2f6c9..d6f990e 100644
--- a/ext/socket/rubysocket.h
+++ b/ext/socket/rubysocket.h
@@ -4,6 +4,7 @@
#include "ruby/ruby.h"
#include "ruby/io.h"
#include "ruby/util.h"
+#include "ruby/subst.h"
#include "internal.h"
#include <stdio.h>
#include <sys/types.h>