diff --git a/ja/overviews/collections/creating-collections-from-scratch.md b/ja/overviews/collections/creating-collections-from-scratch.md
index 0fae788631..58db4a2f5b 100644
--- a/ja/overviews/collections/creating-collections-from-scratch.md
+++ b/ja/overviews/collections/creating-collections-from-scratch.md
@@ -18,7 +18,7 @@ language: ja
     Iterator(1, 2, 3)         // 3つの整数を返すイテレータ
     Set(dog, cat, bird)       // 3種類の動物の集合
     HashSet(dog, cat, bird)   // 同じ動物のハッシュ集合
-    Map(a -> 7, 'b' -> 0)     // 文字から整数へのマップ
+    Map('a' -> 7, 'b' -> 0)   // 文字から整数へのマップ
 
 上の全ての行での呼び出しは内部では何らかのオブジェクトの `apply` メソッドを呼び出している。例えば、3行目は以下のように展開する:
 
diff --git a/overviews/collections/creating-collections-from-scratch.md b/overviews/collections/creating-collections-from-scratch.md
index a89fcc70dd..0bba616794 100644
--- a/overviews/collections/creating-collections-from-scratch.md
+++ b/overviews/collections/creating-collections-from-scratch.md
@@ -18,7 +18,7 @@ You have syntax `List(1, 2, 3)` to create a list of three integers and `Map('A'
     Iterator(1, 2, 3)         // An iterator returning three integers.
     Set(dog, cat, bird)       // A set of three animals
     HashSet(dog, cat, bird)   // A hash set of the same animals
-    Map(a -> 7, 'b' -> 0)     // A map from characters to integers
+    Map('a' -> 7, 'b' -> 0)   // A map from characters to integers
 
 "Under the covers" each of the above lines is a call to the `apply` method of some object. For instance, the third line above expands to