diff --git a/packages/mermaid/src/diagrams/packet/db.ts b/packages/mermaid/src/diagrams/packet/db.ts
index 5adca2e02..d766765fc 100644
--- a/packages/mermaid/src/diagrams/packet/db.ts
+++ b/packages/mermaid/src/diagrams/packet/db.ts
@@ -1,6 +1,7 @@
 import type { Block, PacketDB, Row } from './types.js';
-import { log } from '../../logger.js';
 import type { PacketDiagramConfig } from '../../config.type.js';
+
+import { log } from '../../logger.js';
 import DEFAULT_CONFIG from '../../defaultConfig.js';
 import { getConfig as commonGetConfig } from '../../config.js';
 
diff --git a/packages/mermaid/src/diagrams/packet/renderer.ts b/packages/mermaid/src/diagrams/packet/renderer.ts
index af5c6665a..172f4a202 100644
--- a/packages/mermaid/src/diagrams/packet/renderer.ts
+++ b/packages/mermaid/src/diagrams/packet/renderer.ts
@@ -8,7 +8,7 @@ import type { Diagram } from '../../Diagram.js';
 // eslint-disable-next-line @typescript-eslint/no-unused-vars
 const draw: DrawDefinition = (_text, id, _version, diagram: Diagram) => {
   const db = diagram.db as PacketDB;
-  const config = db.getConfig?.() as Required<PacketDiagramConfig>;
+  const config = db.getConfig();
   const { rowHeight, paddingY, bitWidth, bitsPerRow } = config;
   const words = db.getPacket();
   const svgHeight = (rowHeight + paddingY) * words.length + paddingY;
diff --git a/packages/mermaid/src/diagrams/packet/types.ts b/packages/mermaid/src/diagrams/packet/types.ts
index 5492d4004..1ec25c040 100644
--- a/packages/mermaid/src/diagrams/packet/types.ts
+++ b/packages/mermaid/src/diagrams/packet/types.ts
@@ -1,5 +1,6 @@
 import type { Packet } from 'mermaid-parser';
 import type { DiagramDB } from '../../diagram-api/types.js';
+import type { PacketDiagramConfig } from '../../config.type.js';
 
 export type ArrayElement<A> = A extends readonly (infer T)[] ? T : never;
 export type Block = Pick<ArrayElement<Packet['blocks']>, 'start' | 'end' | 'label'>;
@@ -7,4 +8,5 @@ export type Row = Required<Block>[];
 
 export interface PacketDB extends DiagramDB {
   getPacket: () => Row[];
+  getConfig: () => Required<PacketDiagramConfig>;
 }