diff --git a/conda/migen/meta.yaml b/conda/migen/meta.yaml
index 0e8871c47..263395036 100644
--- a/conda/migen/meta.yaml
+++ b/conda/migen/meta.yaml
@@ -7,8 +7,8 @@ source:
   git_tag: new
 
 build:
-  noarch_python: True
-  number: {{ environ.get("GIT_DESCRIBE_NUMBER", 0) }}
+  noarch_python: true
+  string: py_{{ environ.get("GIT_DESCRIBE_NUMBER", 0) }}
   script: $PYTHON setup.py install
 
 requirements: