diff --git a/tests/RotationIndexerTest.cpp b/tests/RotationIndexerTest.cpp
index d0889b74..b8de88c2 100644
--- a/tests/RotationIndexerTest.cpp
+++ b/tests/RotationIndexerTest.cpp
@@ -30,6 +30,7 @@ TEST_CASE("RotationIndexer") {
 
     // Base lattice (non-pathological)
     CrystalLattice latt_base(40, 50, 80, 90, 90, 90);
+    latt_base = latt_base.Multiply(RotMatrix(5.0, Coord(sqrt(2)/2,sqrt(2)/2,0)));
 
     // Rotation axis: around X with 1 deg per image
     GoniometerAxis axis("omega", 0.0f, 1.0f, Coord(1,0,0), std::nullopt);
@@ -81,5 +82,5 @@ TEST_CASE("RotationIndexer") {
             << ret->search_result.conventional.GetUnitCell().beta << " "
             << ret->search_result.conventional.GetUnitCell().gamma << std::endl;
     CHECK(ret->search_result.centering == 'P');
-    CHECK(ret->search_result.system == gemmi::CrystalSystem::Monoclinic);
+    CHECK(ret->search_result.system == gemmi::CrystalSystem::Orthorhombic);
 }