diff --git a/middleware/sec_fetch_filter.go b/middleware/sec_fetch_filter.go
index 32b1f80..a460862 100644
--- a/middleware/sec_fetch_filter.go
+++ b/middleware/sec_fetch_filter.go
@@ -19,7 +19,7 @@ func SecFetchFilter(next http.Handler) http.Handler {
 		}
 
 		_, exists := allowedSites[r.Header.Get("Sec-Fetch-Site")]
-		if !exists {
+		if exists {
 			next.ServeHTTP(w, r)
 			return
 		}