diff --git a/light/ltface.cc b/light/ltface.cc
index 448a9358..12200262 100644
--- a/light/ltface.cc
+++ b/light/ltface.cc
@@ -3279,7 +3279,7 @@ void DirectLightFace(const mbsp_t *bsp, lightsurf_t &lightsurf, const settings::
         LightFace_LocalMin(bsp, face, &lightsurf, lightmaps);
 
         if (!modelinfo->isWorld() &&
-            std::all_of(lightsurf.occluded.begin(), lightsurf.occluded.end(), std::identity{})) {
+            std::all_of(lightsurf.occluded.begin(), lightsurf.occluded.end(), [](bool v) { return v; })) {
             LightFace_AutoMin(bsp, face, &lightsurf, lightmaps);
         }