diff --git a/crates/engine/tree/src/tree/payload_processor/mod.rs b/crates/engine/tree/src/tree/payload_processor/mod.rs
index 42d0b09d05..214597f620 100644
--- a/crates/engine/tree/src/tree/payload_processor/mod.rs
+++ b/crates/engine/tree/src/tree/payload_processor/mod.rs
@@ -565,7 +565,7 @@ where
 
         let parent_span = Span::current();
         self.executor.spawn_blocking_named("sparse-trie", move || {
-            reth_tasks::once!(increase_thread_priority());
+            reth_tasks::once!(increase_thread_priority);
 
             let _enter = debug_span!(target: "engine::tree::payload_processor", parent: parent_span, "sparse_trie_task")
                 .entered();
diff --git a/crates/tasks/src/utils.rs b/crates/tasks/src/utils.rs
index 74dba9c610..f535922bc2 100644
--- a/crates/tasks/src/utils.rs
+++ b/crates/tasks/src/utils.rs
@@ -2,7 +2,7 @@
 
 pub use thread_priority::{self, *};
 
-/// Runs the given expression exactly once per call site.
+/// Runs the given closure exactly once per call site.
 ///
 /// Each invocation expands to its own `static Once`, so two `once!` calls in the same function
 /// are independent. Useful for one-time thread setup (priority, affinity) on threads that may
@@ -11,7 +11,7 @@ pub use thread_priority::{self, *};
 macro_rules! once {
     ($e:expr) => {{
         static ONCE: std::sync::Once = std::sync::Once::new();
-        ONCE.call_once(|| $e);
+        ONCE.call_once($e);
     }};
 }