diff --git a/ext/opcache/zend_shared_alloc.c b/ext/opcache/zend_shared_alloc.c
index 3f18a4db6040e..b94010945e166 100644
--- a/ext/opcache/zend_shared_alloc.c
+++ b/ext/opcache/zend_shared_alloc.c
@@ -192,6 +192,7 @@ int zend_shared_alloc_startup(size_t requested_size, size_t reserved_size)
 	}
 #if ENABLE_FILE_CACHE_FALLBACK
 	if (ALLOC_FALLBACK == res) {
+		smm_shared_globals = NULL;
 		return ALLOC_FALLBACK;
 	}
 #endif