diff --git a/common/LZMA/SDK/C/CpuArch.c b/common/LZMA/SDK/C/CpuArch.c
index 6e02551e2..674b30ba2 100644
--- a/common/LZMA/SDK/C/CpuArch.c
+++ b/common/LZMA/SDK/C/CpuArch.c
@@ -877,7 +877,7 @@ BoolInt CPU_IsSupported_AES (void) { return APPLE_CRYPTO_SUPPORT_VAL; }
 
 #ifdef USE_HWCAP
 
-#if defined(__FreeBSD__)
+#if defined(__FreeBSD__) || defined(__OpenBSD__)
 static unsigned long MY_getauxval(int aux)
 {
   unsigned long val;