diff --git a/.flatpak-manifest.json b/.flatpak-manifest.json
index 45e21cf9..68941bd8 100644
--- a/.flatpak-manifest.json
+++ b/.flatpak-manifest.json
@@ -58,6 +58,9 @@
         {
             "name": "libvncserver",
             "buildsystem": "cmake-ninja",
+            "config-opts": [
+                "-DCMAKE_POLICY_VERSION_MINIMUM=3.5"
+            ],
             "sources": [
                 {
                     "type": "git",