diff --git a/cpu/cpu_arm64.go b/cpu/cpu_arm64.go
index 951078f..2f64d3b 100644
--- a/cpu/cpu_arm64.go
+++ b/cpu/cpu_arm64.go
@@ -39,7 +39,7 @@
 
 func archInit() {
 	switch runtime.GOOS {
-	case "android", "darwin", "ios", "netbsd":
+	case "android", "darwin", "ios", "netbsd", "openbsd":
 		// Android and iOS don't seem to allow reading these registers.
 		//
 		// NetBSD:
@@ -47,6 +47,9 @@
 		// It can be read via sysctl(3). Example for future implementers:
 		// https://nxr.netbsd.org/xref/src/usr.sbin/cpuctl/arch/aarch64.c
 		//
+		// OpenBSD:
+		// See https://golang.org/issue/31746
+		//
 		// Fake the minimal features expected by
 		// TestARM64minimalFeatures.
 		ARM64.HasASIMD = true