diff --git a/redis/vibe/db/redis/redis.d b/redis/vibe/db/redis/redis.d
index 1e620b020..30179e9f8 100644
--- a/redis/vibe/db/redis/redis.d
+++ b/redis/vibe/db/redis/redis.d
@@ -33,7 +33,7 @@ import std.utf;
 */
 RedisClient connectRedis(string host, ushort port = RedisClient.defaultPort)
 {
-	assert(!host.startsWith("redis://"));
+	assert(!host.startsWith("redis://", "Host must be a valid IP or domain, but not an URI."));
 	return new RedisClient(host, port);
 }