diff --git a/cache/cache.go b/cache/cache.go
index 1564a98..827288e 100644
--- a/cache/cache.go
+++ b/cache/cache.go
@@ -9,7 +9,14 @@ import (
 var Cache = make(map[string]models.CacheItem)
 
 func HasCacheData(key string) bool {
-	_, ok := Cache[key]
+	data, ok := Cache[key]
+	if !ok {
+		return false
+	}
+	if data.IsExpired() {
+		delete(Cache, key)
+		return false
+	}
 	return ok
 }
 
diff --git a/models/cacheItem.go b/models/cacheItem.go
index 12ac6b0..f616c8b 100644
--- a/models/cacheItem.go
+++ b/models/cacheItem.go
@@ -33,3 +33,10 @@ func (c *CacheItem) GetData() (Mensa, error) {
 
 	return c.data, nil
 }
+
+func (c *CacheItem) IsExpired() bool {
+	if time.Now().Unix()-c.lastUpdated.Unix() > c.lifetime {
+		return true
+	}
+	return false
+}