diff --git a/var/spack/repos/builtin/packages/aluminum/package.py b/var/spack/repos/builtin/packages/aluminum/package.py
index 113564de5b..ea8d9e8317 100644
--- a/var/spack/repos/builtin/packages/aluminum/package.py
+++ b/var/spack/repos/builtin/packages/aluminum/package.py
@@ -69,8 +69,8 @@ def cmake_args(self):
             args.append('-DCMAKE_CUDA_STANDARD=14')
             archs = spec.variants['cuda_arch'].value
             if archs != 'none':
-                arch_str = ",".join(archs)
-            args.append('-DCMAKE_CUDA_ARCHITECTURES=%s' % arch_str)
+                arch_str = ";".join(archs)
+                args.append('-DCMAKE_CUDA_ARCHITECTURES=%s' % arch_str)
 
         if spec.satisfies('@0.5:'):
             args.extend([
diff --git a/var/spack/repos/builtin/packages/dihydrogen/package.py b/var/spack/repos/builtin/packages/dihydrogen/package.py
index 0bd36298d2..4a133c0a05 100644
--- a/var/spack/repos/builtin/packages/dihydrogen/package.py
+++ b/var/spack/repos/builtin/packages/dihydrogen/package.py
@@ -159,8 +159,8 @@ def cmake_args(self):
                 args.append('-DCMAKE_CUDA_STANDARD=14')
             archs = spec.variants['cuda_arch'].value
             if archs != 'none':
-                arch_str = ",".join(archs)
-            args.append('-DCMAKE_CUDA_ARCHITECTURES=%s' % arch_str)
+                arch_str = ";".join(archs)
+                args.append('-DCMAKE_CUDA_ARCHITECTURES=%s' % arch_str)
 
         if '+cuda' in spec or '+distconv' in spec:
             args.append('-DcuDNN_DIR={0}'.format(
diff --git a/var/spack/repos/builtin/packages/hydrogen/package.py b/var/spack/repos/builtin/packages/hydrogen/package.py
index 7fb8f1b5f4..61394c4818 100644
--- a/var/spack/repos/builtin/packages/hydrogen/package.py
+++ b/var/spack/repos/builtin/packages/hydrogen/package.py
@@ -164,8 +164,8 @@ def cmake_args(self):
             args.append('-DCMAKE_CUDA_STANDARD=14')
             archs = spec.variants['cuda_arch'].value
             if archs != 'none':
-                arch_str = ",".join(archs)
-            args.append('-DCMAKE_CUDA_ARCHITECTURES=%s' % arch_str)
+                arch_str = ";".join(archs)
+                args.append('-DCMAKE_CUDA_ARCHITECTURES=%s' % arch_str)
 
         if '+rocm' in spec:
             args.extend([
diff --git a/var/spack/repos/builtin/packages/lbann/package.py b/var/spack/repos/builtin/packages/lbann/package.py
index 2471850790..e1a965c616 100644
--- a/var/spack/repos/builtin/packages/lbann/package.py
+++ b/var/spack/repos/builtin/packages/lbann/package.py
@@ -323,8 +323,8 @@ def cmake_args(self):
                 args.append('-DCMAKE_CUDA_STANDARD=14')
             archs = spec.variants['cuda_arch'].value
             if archs != 'none':
-                arch_str = ",".join(archs)
-            args.append('-DCMAKE_CUDA_ARCHITECTURES=%s' % arch_str)
+                arch_str = ";".join(archs)
+                args.append('-DCMAKE_CUDA_ARCHITECTURES=%s' % arch_str)
 
         if spec.satisfies('@:0.90') or spec.satisfies('@0.95:'):
             args.append(