diff --git a/tests/XtalOptimizerTest.cpp b/tests/XtalOptimizerTest.cpp
index c14bc846..2885c974 100644
--- a/tests/XtalOptimizerTest.cpp
+++ b/tests/XtalOptimizerTest.cpp
@@ -436,7 +436,7 @@ TEST_CASE("XtalOptimizer_monoclinic") {
             .PoniRot2_rad(0.02)
             .DetectorDistance_mm(200);
 
-    CrystalLattice latt_i(50,60,70,90,110,90);
+    CrystalLattice latt_i(50,60,70,90,115,90);
 
     auto uc_i = latt_i.GetUnitCell();
 
@@ -455,7 +455,7 @@ TEST_CASE("XtalOptimizer_monoclinic") {
     }
 
     XtalOptimizerData xtal_opt;
-    xtal_opt.latt = CrystalLattice(49.5, 60.5, 69.8, 90, 110, 90);
+    xtal_opt.latt = CrystalLattice(49.5, 60.5, 69.8, 90, 113.5, 90);
     xtal_opt.geom.BeamX_pxl(1007).BeamY_pxl(990).DetectorDistance_mm(200)
             .PoniRot1_rad(0.01).PoniRot2_rad(0.02);
     xtal_opt.crystal_system = gemmi::CrystalSystem::Monoclinic;