diff --git a/src/sparsify/__init__.py b/src/sparsify/__init__.py
index 6c62c2fd..211acfed 100644
--- a/src/sparsify/__init__.py
+++ b/src/sparsify/__init__.py
@@ -31,7 +31,6 @@
 try:
     from sparsezoo.package import check_package_version as _check_package_version
 
-    is_release = True
     _check_package_version(
         package_name=__name__ if is_release else f"{__name__}-nightly",
         package_version=version,