diff --git a/modcc/printer/gpuprinter.cpp b/modcc/printer/gpuprinter.cpp
index 7e8dc2025..0dfbeeb56 100644
--- a/modcc/printer/gpuprinter.cpp
+++ b/modcc/printer/gpuprinter.cpp
@@ -389,9 +389,9 @@ void emit_api_body_cu(std::ostream& out, APIMethod* e, const ApiFlags& flags) {
             // update an indexed variable, like current or conductance.
             // This is the case if one of the external variables "is_write".
             auto it = std::find_if(indexed_vars.begin(), indexed_vars.end(),
-                      [](auto& sym){return sym->external_variable()->is_write();});
-            if (it!=indexed_vars.end()) {
-                out << "unsigned lane_mask_ = arb::gpu::ballot(arb::gpu::active_mask(), tid_<n_);\n";
+                                   [](auto& sym){return sym->external_variable()->is_write();});
+            if (it != indexed_vars.end()) {
+                out << "unsigned lane_mask_ = arb::gpu::ballot(0xffffffff, tid_<n_);\n";
             }
         }
         if (flags.ppack_iface) out << "PPACK_IFACE_BLOCK;\n";
diff --git a/scripts/arbor-build-catalogue b/scripts/arbor-build-catalogue
index d236a3a48..ac5a66125 100755
--- a/scripts/arbor-build-catalogue
+++ b/scripts/arbor-build-catalogue
@@ -149,10 +149,13 @@ if gpu == "cuda":
 include(FindCUDAToolkit)
 add_compile_definitions(ARB_CUDA)
 add_compile_definitions(ARB_HAVE_GPU)
+if(NOT DEFINED CMAKE_CUDA_ARCHITECTURES)
+    # Pascal, Volta, Ampere, Hopper
+    set(CMAKE_CUDA_ARCHITECTURES 60 70 80 90)
+endif()
 find_package(CUDAToolkit)
 enable_language(CUDA)
 set(CMAKE_CUDA_STANDARD 20)
-
 set(CMAKE_CUDA_HOST_COMPILER {args["cxx"]})
 """
 elif gpu == "cuda-clang":