diff --git a/backend/api/installer.go b/backend/api/installer.go
index fac9aaf..dca3724 100644
--- a/backend/api/installer.go
+++ b/backend/api/installer.go
@@ -15,9 +15,9 @@ func (h *Handler) uploadInstaller(w http.ResponseWriter, r *http.Request) {
 	if platform == "" {
 		platform = "freebsd"
 	}
-	validPlatforms := map[string]bool{"freebsd": true, "linux": true}
+	validPlatforms := map[string]bool{"freebsd": true, "linux": true, "windows": true}
 	if !validPlatforms[platform] {
-		writeError(w, http.StatusBadRequest, "Ungueltige Plattform (freebsd, linux)")
+		writeError(w, http.StatusBadRequest, "Ungueltige Plattform (freebsd, linux, windows)")
 		return
 	}