diff --git a/ext/opcache/zend_accelerator_util_funcs.c b/ext/opcache/zend_accelerator_util_funcs.c
index 53efa865..d6975a44 100644
--- a/ext/opcache/zend_accelerator_util_funcs.c
+++ b/ext/opcache/zend_accelerator_util_funcs.c
@@ -24,6 +24,7 @@
 #include "zend_accelerator_util_funcs.h"
 #include "zend_persist.h"
 #include "zend_shared_alloc.h"
+#include <immintrin.h>
 
 #if SIZEOF_SIZE_T <= SIZEOF_ZEND_LONG
 /* If sizeof(void*) == sizeof(zend_ulong) we can use zend_hash index functions */