diff --git a/steamcache/steamcache.go b/steamcache/steamcache.go
index 1845d5d..5fd9b5f 100644
--- a/steamcache/steamcache.go
+++ b/steamcache/steamcache.go
@@ -218,6 +218,10 @@ func (sc *SteamCache) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 	}
 
 	if strings.HasPrefix(r.URL.String(), "/depot/") {
+		// trim the query parameters from the URL path
+		// this is necessary because the cache key should not include query parameters
+		r.URL.Path = strings.Split(r.URL.Path, "?")[0]
+
 		tstart := time.Now()
 		defer func() { responseTime.Observe(time.Since(tstart).Seconds()) }()