diff --git a/is-plain-object.d.cts b/is-plain-object.d.cts
new file mode 100644
index 0000000..34eeeb2
--- /dev/null
+++ b/is-plain-object.d.cts
@@ -0,0 +1,5 @@
+type IsPlainObject = {
+  isPlainObject(o: any): boolean;
+};
+
+export = IsPlainObject;
diff --git a/is-plain-object.d.ts b/is-plain-object.d.mts
similarity index 100%
rename from is-plain-object.d.ts
rename to is-plain-object.d.mts
diff --git a/package.json b/package.json
index 3ea169a..e9760b3 100644
--- a/package.json
+++ b/package.json
@@ -25,6 +25,10 @@
   ],
   "exports": {
     ".": {
+      "types": {
+        "import": "./is-plain-object.d.mts",
+        "require": "./is-plain-object.d.cts"
+      },
       "import": "./dist/is-plain-object.mjs",
       "require": "./dist/is-plain-object.js"
     },