diff --git a/src/ipc/broad_phase/lbvh.cpp b/src/ipc/broad_phase/lbvh.cpp
index f2107839d..97ba8a9c6 100644
--- a/src/ipc/broad_phase/lbvh.cpp
+++ b/src/ipc/broad_phase/lbvh.cpp
@@ -149,13 +149,14 @@ void LBVH::init_bvh(
     {
         IPC_TOOLKIT_PROFILE_BLOCK("compute_morton_codes");
 
-        const Eigen::Array3d mesh_width = mesh_aabb.max - mesh_aabb.min;
+        const Eigen::Array3d mesh_width_inv =
+            1.0 / (mesh_aabb.max - mesh_aabb.min);
         tbb::parallel_for(size_t(0), boxes.size(), [&](size_t i) {
             const auto& box = boxes[i];
 
             const Eigen::Array3d center = 0.5 * (box.min + box.max);
             const Eigen::Array3d mapped_center =
-                (center - mesh_aabb.min) / mesh_width;
+                (center - mesh_aabb.min) * mesh_width_inv;
 
             if (dim == 2) {
                 morton_codes[i].morton_code =
diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index 716cb3c87..7cfa3e9ef 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -76,9 +76,15 @@ if(IPC_TOOLKIT_WITH_CUDA)
   # other libraries and executables.
   set_target_properties(ipc_toolkit_tests PROPERTIES CUDA_SEPARABLE_COMPILATION ON)
 
-  # Use the same CUDA architectures Scalable CCD
-  # get_target_property(CMAKE_CUDA_ARCHITECTURES scalable_ccd CUDA_ARCHITECTURES)
-  set_target_properties(ipc_toolkit_tests PROPERTIES CUDA_ARCHITECTURES "native")
+  # Use the CUDA architectures specified by the user (e.g. via
+  # -DCMAKE_CUDA_ARCHITECTURES) and only fall back to auto-detecting the local
+  # GPU ("native") when none were given. "native" requires a physical GPU, so
+  # the fallback fails in GPU-less environments such as CI/Docker builds.
+  if(DEFINED CMAKE_CUDA_ARCHITECTURES)
+    set_target_properties(ipc_toolkit_tests PROPERTIES CUDA_ARCHITECTURES "${CMAKE_CUDA_ARCHITECTURES}")
+  else()
+    set_target_properties(ipc_toolkit_tests PROPERTIES CUDA_ARCHITECTURES "native")
+  endif()
 endif()
 
 if (IPC_TOOLKIT_TESTS_CCD_BENCHMARK)