diff --git a/packages/conf/DittoConf.ts b/packages/conf/DittoConf.ts
index d6559cca..05e7d19f 100644
--- a/packages/conf/DittoConf.ts
+++ b/packages/conf/DittoConf.ts
@@ -11,8 +11,6 @@ import { getEcdsaPublicKey } from './utils/crypto.ts';
 import { optionalBooleanSchema, optionalNumberSchema } from './utils/schema.ts';
 import { mergeURLPath } from './utils/url.ts';
 
-import { VALID_LOG_TYPES } from '../ditto/utils/logi.ts';
-
 /** Ditto application-wide configuration. */
 export class DittoConf {
   constructor(private env: { get(key: string): string | undefined }) {
@@ -257,12 +255,10 @@ export class DittoConf {
     level ||= 'debug';
     scopes ||= '';
 
-    if (fmt && !VALID_LOG_TYPES.includes(fmt)) {
-      throw new Error(`Invalid log type supplied: Valid types are [${VALID_LOG_TYPES.join('|')}].`);
-    }
+    if (fmt !== 'jsonl' && fmt !== 'pretty') fmt = 'jsonl';
 
     return {
-      fmt: (fmt ?? 'jsonl') as 'jsonl' | 'pretty',
+      fmt: fmt as 'jsonl' | 'pretty',
       level,
       scopes: scopes.split(',').filter(Boolean),
     };
diff --git a/packages/ditto/utils/logi.ts b/packages/ditto/utils/logi.ts
index 0d071254..4b764201 100644
--- a/packages/ditto/utils/logi.ts
+++ b/packages/ditto/utils/logi.ts
@@ -55,8 +55,6 @@ const pair = (key: string, value: LogiValue | undefined) => {
   return `${key}: ${prettyPrint(value || '')}`;
 };
 
-export const VALID_LOG_TYPES = ['jsonl', 'pretty'];
-
 export const createLogiHandler = (conf: DittoConf, defaultHandler: LogiHandler) => (log: LogiLog) => {
   const { fmt, level, scopes } = conf.logConfig;
   if (fmt === 'jsonl') return defaultHandler(log);