diff --git a/ext/opcache/ZendAccelerator.c b/ext/opcache/ZendAccelerator.c
index 99bb33573f3b..1ffd6cb3e5d4 100644
--- a/ext/opcache/ZendAccelerator.c
+++ b/ext/opcache/ZendAccelerator.c
@@ -3197,7 +3197,7 @@ static zend_result accel_post_startup(void)
 			size_t page_size;
 
 			page_size = zend_get_page_size();
-			if (!page_size && (page_size & (page_size - 1))) {
+			if (!page_size || (page_size & (page_size - 1))) {
 				zend_accel_error_noreturn(ACCEL_LOG_FATAL, "Failure to initialize shared memory structures - can't get page size.");
 				abort();
 			}