diff --git a/lib/private/Http/Client/NegativeDnsCache.php b/lib/private/Http/Client/NegativeDnsCache.php
index 550d75a9c08a6..631fa19c90f96 100644
--- a/lib/private/Http/Client/NegativeDnsCache.php
+++ b/lib/private/Http/Client/NegativeDnsCache.php
@@ -46,6 +46,6 @@ public function setNegativeCacheForDnsType(string $domain, int $type, int $ttl)
 	}
 
 	public function isNegativeCached(string $domain, int $type) : bool {
-		return $this->cache->hasKey($this->createCacheKey($domain, $type));
+		return (bool)$this->cache->hasKey($this->createCacheKey($domain, $type));
 	}
 }
diff --git a/lib/private/Memcache/Redis.php b/lib/private/Memcache/Redis.php
index 56470afa0c5c8..303b3afb67ea5 100644
--- a/lib/private/Memcache/Redis.php
+++ b/lib/private/Memcache/Redis.php
@@ -69,7 +69,7 @@ public function set($key, $value, $ttl = 0) {
 	}
 
 	public function hasKey($key) {
-		return self::$cache->exists($this->getNameSpace() . $key);
+		return (bool)self::$cache->exists($this->getNameSpace() . $key);
 	}
 
 	public function remove($key) {