diff --git a/conda/migen/meta.yaml b/conda/migen/meta.yaml
index 368291e20..1cf9baee6 100644
--- a/conda/migen/meta.yaml
+++ b/conda/migen/meta.yaml
@@ -9,7 +9,7 @@ source:
 build:
   noarch_python: true
   number: {{ environ.get("GIT_DESCRIBE_NUMBER", 0) }}
-  string: py_{{ environ.get("GIT_DESCRIBE_NUMBER", 0) }}+git{{ environ.get("GIT_DESCRIBE_HASH")[1:] }}
+  string: py_{{ environ.get("GIT_DESCRIBE_NUMBER", 0) }}+git{{ environ.get("GIT_DESCRIBE_HASH", "")[1:] }}
   script: $PYTHON setup.py install
 
 requirements: