diff --git a/bindings/rust/standard/benchmarks/benches/throughput.rs b/bindings/rust/standard/benchmarks/benches/throughput.rs
index 9acfee93671..0befe4df0d8 100644
--- a/bindings/rust/standard/benchmarks/benches/throughput.rs
+++ b/bindings/rust/standard/benchmarks/benches/throughput.rs
@@ -43,8 +43,8 @@ fn bench_throughput_for_library<T>(
 }
 
 pub fn bench_throughput_cipher_suites(c: &mut Criterion) {
-    // arbitrarily large to cut across TLS record boundaries
-    let mut shared_buf = [0u8; 100000];
+    // 10MB buffer - arbitrarily large to cut across TLS record boundaries.
+    let mut shared_buf = vec![0u8; 10_000_000];
 
     for cipher_suite in CipherSuite::iter() {
         let mut bench_group = c.benchmark_group(format!("throughput-{cipher_suite:?}"));