diff --git a/src/__tests__/__snapshots__/index.test.ts.snap b/src/__tests__/__snapshots__/index.test.ts.snap
index 58557283..356b50a3 100644
--- a/src/__tests__/__snapshots__/index.test.ts.snap
+++ b/src/__tests__/__snapshots__/index.test.ts.snap
@@ -108,6 +108,7 @@ exports[`test existence of exported functions 1`] = `
   "xyToXYObject",
   "xyUniqueX",
   "xyWeightedMerge",
+  "xyEnsureFloat64",
   "xy2ToXY",
   "xreimSortX",
   "xreimZeroFilling",
diff --git a/src/xy/__tests__/xyEnsureFloat64.test.ts b/src/xy/__tests__/xyEnsureFloat64.test.ts
index 64d4b0de..4cfafb85 100644
--- a/src/xy/__tests__/xyEnsureFloat64.test.ts
+++ b/src/xy/__tests__/xyEnsureFloat64.test.ts
@@ -1,4 +1,4 @@
-import { xyEnsureFloat64 } from '../xyEnsureFloat64';
+import { xyEnsureFloat64 } from '../index';
 
 test('normal array', () => {
   const data = {
diff --git a/src/xy/index.ts b/src/xy/index.ts
index 41518f49..93d66e3f 100644
--- a/src/xy/index.ts
+++ b/src/xy/index.ts
@@ -38,3 +38,4 @@ export * from './xyToXYArray';
 export * from './xyToXYObject';
 export * from './xyUniqueX';
 export * from './xyWeightedMerge';
+export * from './xyEnsureFloat64';