diff --git a/src/benchmark/GraphemeBreak.zig b/src/benchmark/GraphemeBreak.zig
index 28de82593..e576c71ef 100644
--- a/src/benchmark/GraphemeBreak.zig
+++ b/src/benchmark/GraphemeBreak.zig
@@ -146,7 +146,7 @@ fn stepUucode(ptr: *anyopaque) Benchmark.Error!void {
     var d: UTF8Decoder = .{};
     var state: uucode.grapheme.BreakState = .default;
     var cp1: u21 = 0;
-    var buf: [4096]u8 = undefined;
+    var buf: [4096]u8 align(std.atomic.cache_line) = undefined;
     while (true) {
         const n = r.read(&buf) catch |err| {
             log.warn("error reading data file err={}", .{err});
diff --git a/src/benchmark/TerminalParser.zig b/src/benchmark/TerminalParser.zig
index 002af4831..3065c1ed6 100644
--- a/src/benchmark/TerminalParser.zig
+++ b/src/benchmark/TerminalParser.zig
@@ -79,7 +79,7 @@ fn step(ptr: *anyopaque) Benchmark.Error!void {
 
     var p: terminalpkg.Parser = .init();
 
-    var buf: [4096]u8 = undefined;
+    var buf: [4096]u8 align(std.atomic.cache_line) = undefined;
     while (true) {
         const n = r.read(&buf) catch |err| {
             log.warn("error reading data file err={}", .{err});
diff --git a/src/benchmark/TerminalStream.zig b/src/benchmark/TerminalStream.zig
index 28a95226c..71ab1fdfc 100644
--- a/src/benchmark/TerminalStream.zig
+++ b/src/benchmark/TerminalStream.zig
@@ -115,7 +115,7 @@ fn step(ptr: *anyopaque) Benchmark.Error!void {
     const f = self.data_f orelse return;
     var r = std.io.bufferedReader(f.reader());
 
-    var buf: [4096]u8 = undefined;
+    var buf: [4096]u8 align(std.atomic.cache_line) = undefined;
     while (true) {
         const n = r.read(&buf) catch |err| {
             log.warn("error reading data file err={}", .{err});