diff --git a/lib/function/trigonometry/sin.js b/lib/function/trigonometry/sin.js
index 03bcd3401..a188466b8 100644
--- a/lib/function/trigonometry/sin.js
+++ b/lib/function/trigonometry/sin.js
@@ -40,7 +40,7 @@ module.exports = function (math) {
 
     if (isUnit(x)) {
       if (!x.hasBase(Unit.BASE_UNITS.ANGLE)) {
-        throw new TypeError ('Unit in function cos is no angle');
+        throw new TypeError ('Unit in function sin is no angle');
       }
       return Math.sin(x.value);
     }