diff --git a/crypto/bio/b_sock.c b/crypto/bio/b_sock.c
index eaa471685..d20042a3e 100644
--- a/crypto/bio/b_sock.c
+++ b/crypto/bio/b_sock.c
@@ -363,7 +363,7 @@ struct hostent *BIO_gethostbyname(const char *name)
 
 		/* else add to cache */
 		if (ghbn_cache[lowi].ent != NULL)
-			ghbn_free(ghbn_cache[lowi].ent);
+			ghbn_free(ghbn_cache[lowi].ent); /* XXX not thread-safe */
 		ghbn_cache[lowi].name[0] = '\0';
 
 		if((ret=ghbn_cache[lowi].ent=ghbn_dup(ret)) == NULL)