diff --git a/types/obj-str/index.d.ts b/types/obj-str/index.d.ts
new file mode 100644
index 0000000000..44672fbd0a
--- /dev/null
+++ b/types/obj-str/index.d.ts
@@ -0,0 +1,8 @@
+// Type definitions for obj-str 1.0
+// Project: https://github.com/lukeed/obj-str#readme
+// Definitions by: Sascha Englert <https://github.com/saenglert>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+export = objstr;
+
+declare function objstr(obj: { [name: string]: boolean }): string;
diff --git a/types/obj-str/obj-str-tests.ts b/types/obj-str/obj-str-tests.ts
new file mode 100644
index 0000000000..e945aef673
--- /dev/null
+++ b/types/obj-str/obj-str-tests.ts
@@ -0,0 +1,6 @@
+import objstr = require('obj-str');
+
+const isTrue = () => true;
+
+objstr({ foo: true, bar: false, baz: isTrue() });
+// => 'foo baz'
diff --git a/types/obj-str/tsconfig.json b/types/obj-str/tsconfig.json
new file mode 100644
index 0000000000..e2498d5707
--- /dev/null
+++ b/types/obj-str/tsconfig.json
@@ -0,0 +1,16 @@
+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "lib": ["es6"],
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictNullChecks": true,
+        "baseUrl": "../",
+        "typeRoots": ["../"],
+        "strictFunctionTypes": true,
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true
+    },
+    "files": ["index.d.ts", "obj-str-tests.ts"]
+}
diff --git a/types/obj-str/tslint.json b/types/obj-str/tslint.json
new file mode 100644
index 0000000000..3db14f85ea
--- /dev/null
+++ b/types/obj-str/tslint.json
@@ -0,0 +1 @@
+{ "extends": "dtslint/dt.json" }