diff --git a/packages/util/src/format/formatBalance.ts b/packages/util/src/format/formatBalance.ts
index 568277379..0f97f1293 100644
--- a/packages/util/src/format/formatBalance.ts
+++ b/packages/util/src/format/formatBalance.ts
@@ -2,14 +2,14 @@
 // This software may be modified and distributed under the terms
 // of the Apache-2.0 license. See the LICENSE file for details.
 
-import { ToBn } from '../types';
+import { SiDef, ToBn } from '../types';
 
 import BN from 'bn.js';
 
 import bnToBn from '../bn/toBn';
 import isUndefined from '../is/undefined';
 import formatDecimal from './formatDecimal';
-import { SI, SI_MID, SiDef, calcSi, findSi } from './si';
+import { SI, SI_MID, calcSi, findSi } from './si';
 
 interface Defaults {
   decimals: number;
diff --git a/packages/util/src/format/si.ts b/packages/util/src/format/si.ts
index 5cabf36d3..a97b92137 100644
--- a/packages/util/src/format/si.ts
+++ b/packages/util/src/format/si.ts
@@ -2,11 +2,7 @@
 // This software may be modified and distributed under the terms
 // of the Apache-2.0 license. See the LICENSE file for details.
 
-export interface SiDef {
-  power: number;
-  text: string;
-  value: string;
-}
+import { SiDef } from '../types';
 
 export const SI_MID = 8;
 
diff --git a/packages/util/src/types.ts b/packages/util/src/types.ts
index df093665e..a662fa88f 100644
--- a/packages/util/src/types.ts
+++ b/packages/util/src/types.ts
@@ -8,6 +8,12 @@ export interface ToBn {
   toBn: () => BN;
 }
 
+export interface SiDef {
+  power: number;
+  text: string;
+  value: string;
+}
+
 // eslint-disable-next-line @typescript-eslint/no-explicit-any
 type Logger$Data$Fn = () => any[];
 // eslint-disable-next-line @typescript-eslint/no-explicit-any