diff --git a/src/gil.rs b/src/gil.rs
index 5a6b4bca0a0..8d04641063e 100644
--- a/src/gil.rs
+++ b/src/gil.rs
@@ -284,7 +284,7 @@ struct PendingDecRef(NonNull<ffi::PyObject>);
 unsafe impl Send for PendingDecRef {}
 
 #[cfg(not(pyo3_disable_reference_pool))]
-static POOL: Collector<PendingDecRef, 32> = Collector::new();
+static POOL: Collector<PendingDecRef, 30> = Collector::new();
 
 fn update_counts(_py: Python<'_>) {
     for obj in POOL.collect() {