diff --git a/Zend/zend_compile.c b/Zend/zend_compile.c
index a2f126fb101d..882b1bf990bf 100644
--- a/Zend/zend_compile.c
+++ b/Zend/zend_compile.c
@@ -5916,6 +5916,8 @@ static void zend_compile_static_var_common(zend_string *var_name, zval *value, u
 	opline = zend_emit_op(NULL, ZEND_BIND_STATIC, NULL, NULL);
 	opline->op1_type = IS_CV;
 	opline->op1.var = lookup_cv(var_name);
+
+	ZEND_STATIC_ASSERT(sizeof(Bucket) % 8 == 0, "Bucket size not compatible with storing flags in lower three bits");
 	opline->extended_value = (uint32_t)((char*)value - (char*)CG(active_op_array)->static_variables->arData) | mode;
 }
 /* }}} */