diff --git a/ext/opcache/zend_accelerator_module.c b/ext/opcache/zend_accelerator_module.c
index 3d4a9f8c687..2c6f14f9ea5 100644
--- a/ext/opcache/zend_accelerator_module.c
+++ b/ext/opcache/zend_accelerator_module.c
@@ -71,7 +71,7 @@ static ZEND_INI_MH(OnUpdateMemoryConsumption)
 		return FAILURE;
 	}
 	if (UNEXPECTED(memsize > ZEND_LONG_MAX / (1024 * 1024))) {
-		*p = ZEND_LONG_MAX;
+		*p = ZEND_LONG_MAX & ~(1024 * 1024 - 1);
 	} else {
 		*p = memsize * (1024 * 1024);
 	}