diff --git a/var/spack/repos/builtin/packages/acts/package.py b/var/spack/repos/builtin/packages/acts/package.py
index 1d25236113c..0b21cb37d40 100644
--- a/var/spack/repos/builtin/packages/acts/package.py
+++ b/var/spack/repos/builtin/packages/acts/package.py
@@ -478,6 +478,8 @@ def plugin_cmake_variant(plugin_name, spack_variant):
             cuda_arch = spec.variants["cuda_arch"].value
             if cuda_arch != "none":
                 args.append(f"-DCUDA_FLAGS=-arch=sm_{cuda_arch[0]}")
+                arch_str = ";".join(self.spec.variants["cuda_arch"].value)
+                args.append(self.define("CMAKE_CUDA_ARCHITECTURES", arch_str))
 
         args.append(self.define_from_variant("CMAKE_CXX_STANDARD", "cxxstd"))