diff --git a/src/aedifix/__init__.py b/src/aedifix/__init__.py
index 3b22c3f..a7f7e23 100644
--- a/src/aedifix/__init__.py
+++ b/src/aedifix/__init__.py
@@ -13,6 +13,7 @@
     CMakeList,
     CMakePath,
     CMaker,
+    CMakeSemiColonList,
     CMakeString,
 )
 from .main import basic_configure
@@ -28,6 +29,7 @@
     "CMakeInt",
     "CMakeList",
     "CMakePath",
+    "CMakeSemiColonList",
     "CMakeString",
     "CMaker",
     "ConfigArgument",
diff --git a/src/aedifix/cmake/__init__.py b/src/aedifix/cmake/__init__.py
index 5704267..0f04bf3 100644
--- a/src/aedifix/cmake/__init__.py
+++ b/src/aedifix/cmake/__init__.py
@@ -10,6 +10,7 @@
     CMakeInt,
     CMakeList,
     CMakePath,
+    CMakeSemiColonList,
     CMakeString,
 )
 from .cmaker import CMaker
@@ -21,6 +22,7 @@
     "CMakeInt",
     "CMakeList",
     "CMakePath",
+    "CMakeSemiColonList",
     "CMakeString",
     "CMaker",
 )
diff --git a/src/aedifix/cmake/cmake_flags.py b/src/aedifix/cmake/cmake_flags.py
index 7a670c8..dc22cff 100644
--- a/src/aedifix/cmake/cmake_flags.py
+++ b/src/aedifix/cmake/cmake_flags.py
@@ -237,14 +237,22 @@ def _canonicalize_cb(self) -> tuple[bool, list[str] | None]:
             val = [v for v in (str(x).strip() for x in val) if v]
         return bool(val), val
 
-    def to_command_line(self, *, quote: bool = False) -> str:
+    def _cmake_list_to_command_line(self, *, quote: bool, sep: str) -> str:
         if (val := self.value) is None:
             val = []
-        val = " ".join(map(str, val))
+        val = sep.join(map(str, val))
         if quote:
             val = shlex_quote(val)
         return f"{self.prefix}{self.name}:{self.type}={val}"
 
+    def to_command_line(self, *, quote: bool = False) -> str:
+        return self._cmake_list_to_command_line(quote=quote, sep=" ")
+
+
+class CMakeSemiColonList(CMakeList):
+    def to_command_line(self, *, quote: bool = False) -> str:
+        return self._cmake_list_to_command_line(quote=quote, sep=";")
+
 
 class CMakeBool(CMakeFlagBase):
     def __init__(
diff --git a/src/aedifix/packages/cuda.py b/src/aedifix/packages/cuda.py
index 9ef58b4..a1b6cb0 100644
--- a/src/aedifix/packages/cuda.py
+++ b/src/aedifix/packages/cuda.py
@@ -10,7 +10,13 @@
 from pathlib import Path
 from typing import TYPE_CHECKING, Final
 
-from ..cmake import CMAKE_VARIABLE, CMakeExecutable, CMakeList, CMakePath
+from ..cmake import (
+    CMAKE_VARIABLE,
+    CMakeExecutable,
+    CMakeList,
+    CMakePath,
+    CMakeSemiColonList,
+)
 from ..package import Package
 from ..util.argument_parser import ArgSpec, ConfigArgument
 
@@ -143,7 +149,9 @@ class CUDA(Package):
                 "'ampere' or 'hopper, blackwell'"
             ),
         ),
-        cmake_var=CMAKE_VARIABLE("CMAKE_CUDA_ARCHITECTURES", CMakeList),
+        cmake_var=CMAKE_VARIABLE(
+            "CMAKE_CUDA_ARCHITECTURES", CMakeSemiColonList
+        ),
     )
 
     def configure(self) -> None:
diff --git a/tests/cmake/test_cmake_flags.py b/tests/cmake/test_cmake_flags.py
index bec59c2..b084cc2 100644
--- a/tests/cmake/test_cmake_flags.py
+++ b/tests/cmake/test_cmake_flags.py
@@ -18,6 +18,7 @@
     CMakeInt,
     CMakeList,
     CMakePath,
+    CMakeSemiColonList,
     CMakeString,
 )
 
@@ -106,6 +107,90 @@ def test_neq(self) -> None:
         assert lhs != rhs_b
 
 
+class TestCMakeSemiColonList:
+    def test_create(self) -> None:
+        var = CMakeSemiColonList("foo")
+        assert var.name == "foo"
+        assert var.value is None
+        assert var.prefix == "-D"
+        assert var.type == "STRING"
+
+        var = CMakeSemiColonList("foo", value=[1, 2, 3])
+        assert var.name == "foo"
+        assert var.value == [1, 2, 3]
+        assert var.prefix == "-D"
+        assert var.type == "STRING"
+
+        var = CMakeSemiColonList("foo", value=(1, 2, 3), prefix="bar")
+        assert var.name == "foo"
+        assert var.value == [1, 2, 3]
+        assert var.prefix == "bar"
+        assert var.type == "STRING"
+
+        var = CMakeSemiColonList("foo", value="foo;bar")
+        assert var.name == "foo"
+        assert var.value == ["foo", "bar"]
+        assert var.prefix == "-D"
+        assert var.type == "STRING"
+
+    def test_create_bad(self) -> None:
+        # looking for "<class 'int'>" here
+        with pytest.raises(TypeError, match=re.escape(rf"{int}")):
+            CMakeSemiColonList("foo", value=1)  # type: ignore[arg-type]
+
+    def test_canonicalize(self) -> None:
+        var = CMakeSemiColonList("foo")
+        canon = var.canonicalize()
+        assert canon is None
+        assert id(canon) != id(var)  # must be distinct
+        assert var.name == "foo"
+        assert var.value is None
+        assert var.prefix == "-D"
+        assert var.type == "STRING"
+
+        var.value = [4, 5, 6]
+        canon = var.canonicalize()
+        assert isinstance(canon, CMakeSemiColonList)
+        assert id(canon) != id(var)  # must be distinct
+        assert canon.name == var.name
+        assert canon.value == list(map(str, var.value))
+        assert id(canon.value) != id(var.value)  # must be distinct
+        assert canon.prefix == var.prefix
+        assert canon.type == var.type
+
+    @pytest.mark.parametrize(
+        "value", (None, [], ["1"], ["1", "2"], [34, 99, 999])
+    )
+    def test_to_command_line(self, value: list[str]) -> None:
+        val_copy = copy.deepcopy(value)
+        var = CMakeSemiColonList("foo", value=value)
+        cmd = var.to_command_line()
+        assert isinstance(cmd, str)
+        expected_str = "" if val_copy is None else ";".join(map(str, val_copy))
+        assert cmd == f"-Dfoo:STRING={expected_str}"
+        assert var.value == val_copy
+
+    def test_eq(self) -> None:
+        lhs = CMakeSemiColonList("foo", value=(1, 2, 3), prefix="bar")
+        rhs = CMakeSemiColonList("foo", value=(1, 2, 3), prefix="bar")
+        assert lhs == rhs
+
+    def test_neq(self) -> None:
+        lhs = CMakeSemiColonList("foo", value=(1, 2, 3), prefix="bar")
+
+        rhs = CMakeSemiColonList("bar", value=(1, 2, 3), prefix="bar")
+        assert lhs != rhs
+
+        rhs = CMakeSemiColonList("foo", value=(1, 2, 3, 4), prefix="bar")
+        assert lhs != rhs
+
+        rhs = CMakeSemiColonList("foo", value=(1, 2, 3), prefix="asdasd")
+        assert lhs != rhs
+
+        rhs_b = CMakeBool("foo", value=None, prefix="asdasd")
+        assert lhs != rhs_b
+
+
 class TestCMakeBool:
     def test_create(self) -> None:
         var = CMakeBool("foo")