diff --git a/var/sys_repo/systems/sierra/system.py b/var/sys_repo/systems/sierra/system.py
index 3a0816aa..f747dbc5 100644
--- a/var/sys_repo/systems/sierra/system.py
+++ b/var/sys_repo/systems/sierra/system.py
@@ -42,7 +42,7 @@ def generate_description(self, output_dir):
             f.write(self.sw_description())
 
     def system_specific_variables(self):
-        return {"cuda_arch": "70", "default_cuda_version": f"\"{self.spec.variants['cuda'][0]}\""}
+        return {"cuda_arch": "70", "default_cuda_version": self.spec.variants["cuda"][0].replace("-",".")}
 
     def external_pkg_configs(self):
         externals = Sierra.resource_location / "externals"