diff --git a/qbsp/test_qbsp.cc b/qbsp/test_qbsp.cc
index 7766f52b..ba0836df 100644
--- a/qbsp/test_qbsp.cc
+++ b/qbsp/test_qbsp.cc
@@ -510,6 +510,14 @@ TEST_CASE("simple_sealed", "[testmaps_q1]")
 
     // no bspx lumps
     CHECK(bspx.empty());
+
+    // check markfaces
+    CHECK(bsp.dleafs[0].nummarksurfaces == 0);
+    CHECK(bsp.dleafs[0].firstmarksurface == 0);
+
+    CHECK(bsp.dleafs[1].nummarksurfaces == 6);
+    CHECK(bsp.dleafs[1].firstmarksurface == 0);
+    CHECK_THAT(bsp.dleaffaces, Catch::UnorderedEquals(std::vector<uint32_t>{0,1,2,3,4,5}));
 }
 
 TEST_CASE("simple_sealed2", "[testmaps_q1]")