diff --git a/packages/math/vector/index.js b/packages/math/vector/index.js
index 80fbe95..c65912d 100644
--- a/packages/math/vector/index.js
+++ b/packages/math/vector/index.js
@@ -37,7 +37,7 @@ export function sub(l, r) {
 //     avocado> Vector.mul [3, 5], [5, 5]
 //     [15, 25]
 export function mul(l, r) {
-  [l[0] * r[0], l[1] * r[1]];
+  return [l[0] * r[0], l[1] * r[1]];
 }
 
 // Divide two vectors.