diff --git a/ext/opcache/zend_shared_alloc.c b/ext/opcache/zend_shared_alloc.c
index c19d72c63b7..3901fc9c840 100644
--- a/ext/opcache/zend_shared_alloc.c
+++ b/ext/opcache/zend_shared_alloc.c
@@ -371,6 +371,11 @@ void *zend_shared_alloc(size_t size)
 	int i;
 	size_t block_size = ZEND_ALIGNED_SIZE(size);
 
+#if 1
+	if (!ZCG(locked)) {
+		zend_accel_error_noreturn(ACCEL_LOG_ERROR, "Shared memory lock not obtained");
+	}
+#endif
 	if (block_size > ZSMMG(shared_free)) { /* No hope to find a big-enough block */
 		SHARED_ALLOC_FAILED();
 		return NULL;