diff --git a/src/backend/libpq/be-secure.c b/src/backend/libpq/be-secure.c
index 43633e7..fc749f4 100644
--- a/src/backend/libpq/be-secure.c
+++ b/src/backend/libpq/be-secure.c
@@ -880,9 +880,9 @@ initialize_SSL(void)
 							SSLerrmessage())));
 	}
 
-	/* set up ephemeral DH keys, and disallow SSL v2 while at it */
+	/* set up ephemeral DH keys, and disallow SSL v2/v3 while at it */
 	SSL_CTX_set_tmp_dh_callback(SSL_context, tmp_dh_cb);
-	SSL_CTX_set_options(SSL_context, SSL_OP_SINGLE_DH_USE | SSL_OP_NO_SSLv2);
+	SSL_CTX_set_options(SSL_context, SSL_OP_SINGLE_DH_USE | SSL_OP_NO_SSLv2 | SSL_OP_NO_SSLv3);
 
 	/* set up ephemeral ECDH keys */
 	initialize_ecdh();