diff --git a/cpu/cpu_arm64.go b/cpu/cpu_arm64.go
index bbaba18b..f3eb993b 100644
--- a/cpu/cpu_arm64.go
+++ b/cpu/cpu_arm64.go
@@ -6,7 +6,10 @@ package cpu
 
 import "runtime"
 
-const cacheLineSize = 64
+// cacheLineSize is used to prevent false sharing of cache lines.
+// We choose 128 because Apple Silicon, a.k.a. M1, has 128-byte cache line size.
+// It doesn't cost much and is much more future-proof.
+const cacheLineSize = 128
 
 func initOptions() {
 	options = []option{