diff --git a/crypto/opensslv.h b/crypto/opensslv.h
index 541891f239..2d92f5a856 100644
--- a/crypto/opensslv.h
+++ b/crypto/opensslv.h
@@ -1,3 +1,8 @@
+#ifndef HEADER_OPENSSLV_H
+#define HEADER_OPENSSLV_H
+
 #define OPENSSL_VERSION_NUMBER	0x0923	/* Version 0.9.1c is 0913 */
 #define OPENSSL_VERSION_TEXT	"OpenSSL 0.9.2c 01 Apr 1999"
 #define OPENSSL_VERSION_PTEXT	" part of " OPENSSL_VERSION_TEXT
+
+#endif /* HEADER_OPENSSLV_H */