diff --git a/pyperformance/data-files/benchmarks/MANIFEST b/pyperformance/data-files/benchmarks/MANIFEST
index 8b28b9db..69aea2b9 100644
--- a/pyperformance/data-files/benchmarks/MANIFEST
+++ b/pyperformance/data-files/benchmarks/MANIFEST
@@ -37,6 +37,9 @@ chaos	<local>
 comprehensions	<local>
 crypto_pyaes	<local>
 dask	<local>
+# FIXME: this doesn't work with `_pydecimal`
+# decimal_factorial	<local>
+decimal_pi	<local>
 deepcopy	<local>
 deltablue	<local>
 django_template	<local>