diff --git a/d3/d3.d.ts b/d3/d3.d.ts
index 988f7cfd0..2fe18dad8 100644
--- a/d3/d3.d.ts
+++ b/d3/d3.d.ts
@@ -188,7 +188,7 @@ declare module D3 {
         *
         * @param definition 2D affine transform string
         */
-        transform(definition: string): any[];
+        transform(definition: string): any;
         /**
         * Transpose an array of arrays.
         *
diff --git a/mocha/mocha.d.ts b/mocha/mocha.d.ts
index f9d8040b1..717d080dc 100644
--- a/mocha/mocha.d.ts
+++ b/mocha/mocha.d.ts
@@ -3,6 +3,17 @@
 // Definitions by: Kazi Manzur Rashid <https://github.com/kazimanzurrashid/>
 // DefinitelyTyped: https://github.com/borisyankov/DefinitelyTyped
 
+interface Mocha {
+    setup(options: MochaSetupOptions);
+    run(callback: () => void);
+}
+
+interface MochaSetupOptions {
+    slow: number;
+    timeout: number;
+    ui: string;
+}
+
 declare var describe : {
     (description: string, spec: () => void): void;
     only(description: string, spec: () => void): void;