diff --git a/runtime/src/in_mem_accounts_index.rs b/runtime/src/in_mem_accounts_index.rs
index 460edb8bcd..b2af1bcd8e 100644
--- a/runtime/src/in_mem_accounts_index.rs
+++ b/runtime/src/in_mem_accounts_index.rs
@@ -864,7 +864,7 @@ impl<T: IndexValue> InMemAccountsIndex<T> {
     }
 
     pub(crate) fn flush(&self) {
-        let flushing = self.flushing_active.swap(true, Ordering::Acquire);
+        let flushing = self.flushing_active.swap(true, Ordering::AcqRel);
         if flushing {
             // already flushing in another thread
             return;