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diff --git a/src/hitch.h b/src/hitch.h
index 1771416..d28b092 100644
--- a/src/hitch.h
+++ b/src/hitch.h
@@ -104,7 +104,7 @@ typedef struct sni_name_s {
 	UT_hash_handle		hh;
 } sni_name;
 
-sni_name *sni_names;
+extern sni_name *sni_names;
 
 #endif /* OPENSSL_NO_TLSEXT */