diff --git a/pyproject.toml b/pyproject.toml
index d987e2fee0..159907ac8e 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -132,8 +132,6 @@ exclude = [
   "/src/black/concurrency.py",
   "/src/black/files.py",
   "/src/black/report.py",
-  # Pickling of FileData is broken, skip compilation for now:
-  "/src/black/cache.py",
   # Breaks the test suite when compiled (and is also useless):
   "/src/black/debug.py",
   # Compiled modules can't be run directly and that's a problem here: