diff --git a/jest.config.ts b/jest.config.ts
index 85289d31105bb3e45a8519df5b1137e931185b3e..1e5b8e453ae0be9aff65a9905646095639ac17d4 100644
--- a/jest.config.ts
+++ b/jest.config.ts
@@ -5,6 +5,14 @@ const config: JestConfigWithTsJest = {
   testEnvironment: "node",
   reporters: ["default", "jest-junit"],
   coverageProvider: "v8",
+  transform: {
+    "^.+\\.m?[tj]sx?$": [
+      "ts-jest",
+      {
+        tsconfig: "tests/tsconfig.json",
+      },
+    ],
+  },
 };
 
 export default config;
diff --git a/tests/tsconfig.json b/tests/tsconfig.json
index 6ddab7ad84a0055407b85634ffba8270cd7781e5..e6db6f1651e18a64c8d6e026b0d5510d56f15960 100644
--- a/tests/tsconfig.json
+++ b/tests/tsconfig.json
@@ -4,4 +4,7 @@
     "declaration": true,
     "module": "commonjs"
   },
+  "files": [
+    "./index.d.ts"
+  ]
 }
diff --git a/tsconfig.json b/tsconfig.json
index 5136c1bfd74e88b9abfd0e55735dd398ad833483..c5294d3dc9ae637e2b6e97cb6838cd9eefc848f4 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -6,9 +6,6 @@
     "sourceMap": true,
     "outDir": "./lib",
   },
-  "files": [
-    "./tests/index.d.ts"
-  ],
   "include": [
     "src"
   ],