diff --git a/src/zoom.js b/src/zoom.js
index 01e3a2d36..95c5e846c 100644
--- a/src/zoom.js
+++ b/src/zoom.js
@@ -355,7 +355,7 @@ export default function() {
     }
     else if (g.touch0) p = g.touch0[0], l = g.touch0[1];
     else return;
-    g.zoom("touch", constrain(translate(t, p, l), g.extent), translateExtent);
+    g.zoom("touch", constrain(translate(t, p, l), g.extent, translateExtent));
   }
 
   function touchended() {