diff --git a/var/spack/repos/builtin/packages/wgl/package.py b/var/spack/repos/builtin/packages/wgl/package.py
index 17be11243d8..9a3a0bc7e7d 100644
--- a/var/spack/repos/builtin/packages/wgl/package.py
+++ b/var/spack/repos/builtin/packages/wgl/package.py
@@ -69,7 +69,7 @@ def determine_version(cls, lib):
         return ver_str if not ver_str else Version(ver_str.group())
 
     def _spec_arch_to_sdk_arch(self):
-        spec_arch = str(self.spec.architecture.target).lower()
+        spec_arch = str(self.spec.architecture.target.microarchitecture.family).lower()
         _64bit = "64" in spec_arch
         arm = "arm" in spec_arch
         if arm: