diff --git a/conda/migen/meta.yaml b/conda/migen/meta.yaml
index 7eb932980..c1e78eb64 100644
--- a/conda/migen/meta.yaml
+++ b/conda/migen/meta.yaml
@@ -7,7 +7,8 @@ source:
   git_tag: master
 
 build:
-  number: {{ environ.get("GIT_DESCRIBE_NUMBER", 0) }}
+  noarch_python: true
+  string: py_{{ environ.get("GIT_DESCRIBE_NUMBER", 0) }}
   script: $PYTHON setup.py install
 
 requirements: