diff --git a/var/spack/repos/builtin/packages/camp/package.py b/var/spack/repos/builtin/packages/camp/package.py
index b6a18a0a96e..de6117d4100 100644
--- a/var/spack/repos/builtin/packages/camp/package.py
+++ b/var/spack/repos/builtin/packages/camp/package.py
@@ -109,7 +109,7 @@ def cmake_args(self):
         if spec.satisfies("+rocm"):
             options.append("-DHIP_ROOT_DIR={0}".format(spec["hip"].prefix))
 
-            archs = self.spec.variants["amdgpu_target"].value
+            archs = ";".join(self.spec.variants["amdgpu_target"].value)
             options.append("-DCMAKE_HIP_ARCHITECTURES={0}".format(archs))
             options.append("-DGPU_TARGETS={0}".format(archs))
             options.append("-DAMDGPU_TARGETS={0}".format(archs))