diff --git a/setup.py b/setup.py
index ce4e642c3..cf939b469 100755
--- a/setup.py
+++ b/setup.py
@@ -41,7 +41,7 @@
 ]
 
 rust_extensions = [
-    RustExtension("dulwich._objects", "crates/objects/Cargo.toml", binding=Binding.PyO3, optional = True),
+    RustExtension("dulwich._objects", "crates/objects/Cargo.toml", binding=Binding.PyO3, optional=True),
 ]
 
 # Ideally, setuptools would just provide a way to do this