diff --git a/crypto/cryptlib.c b/crypto/cryptlib.c
index 4580d04c2..bed102a2e 100644
--- a/crypto/cryptlib.c
+++ b/crypto/cryptlib.c
@@ -460,7 +460,7 @@ const char *CRYPTO_get_lock_name(int type)
 		return("dynamic");
 	else if (type < CRYPTO_NUM_LOCKS)
 		return(lock_names[type]);
-	else if (type-CRYPTO_NUM_LOCKS >= sk_num(app_locks))
+	else if (type-CRYPTO_NUM_LOCKS > sk_num(app_locks))
 		return("ERROR");
 	else
 		return(sk_value(app_locks,type-CRYPTO_NUM_LOCKS));