diff --git a/image/private/js-impl.js b/image/private/js-impl.js
index 003775f..3ee0ec3 100644
--- a/image/private/js-impl.js
+++ b/image/private/js-impl.js
@@ -118,7 +118,7 @@ var checkPlaceX = plt.baselib.check.makeCheckArgumentType(
     'x-place');
 
 var checkPlaceY = plt.baselib.check.makeCheckArgumentType(
-    isPlaceX,
+    isPlaceY,
     'y-place');