diff --git a/lib/svg-to-css.js b/lib/svg-to-css.js
index c45b035..2509919 100644
--- a/lib/svg-to-css.js
+++ b/lib/svg-to-css.js
@@ -170,8 +170,8 @@ export function svgAttTransformToCSS(attValue) {
 }
 
 /**
- * @param {import('./exactnum.js').ExactNum} tx
- * @param {import('./exactnum.js').ExactNum} ty
+ * @param {import('./types.js').ExactNum} tx
+ * @param {import('./types.js').ExactNum} ty
  * @returns {import('./types-css-decl.js').CSSTransFnTranslate}
  */
 function makeCSSTranslate(tx, ty) {
diff --git a/lib/types-css-decl.d.ts b/lib/types-css-decl.d.ts
index 6abc095..506d97e 100644
--- a/lib/types-css-decl.d.ts
+++ b/lib/types-css-decl.d.ts
@@ -1,4 +1,4 @@
-import type { ExactNum } from './exactnum.js';
+import type { ExactNum } from './types.js';
 
 export type CSSTypeAngle = {
   n: ExactNum;
diff --git a/lib/types-svg-attr.d.ts b/lib/types-svg-attr.d.ts
index c46dd6c..4275e9c 100644
--- a/lib/types-svg-attr.d.ts
+++ b/lib/types-svg-attr.d.ts
@@ -1,4 +1,4 @@
-import type { ExactNum } from './exactnum.js';
+import type { ExactNum } from './types.js';
 
 export type SVGTransFnMatrix = {
   name: 'matrix';
diff --git a/lib/types.d.ts b/lib/types.d.ts
index b1d3fed..cac0b49 100644
--- a/lib/types.d.ts
+++ b/lib/types.d.ts
@@ -243,3 +243,12 @@ export type PathDataItem = {
 };
 
 export type DataUri = 'base64' | 'enc' | 'unenc';
+
+export type ExactNum = {
+  clone(): ExactNum;
+  getMinifiedString(): string;
+  isEqualTo(n: ExactNum): boolean;
+  isZero(): boolean;
+  negate(): ExactNum;
+  setNumberOfDigits(d: number): void;
+};