diff --git a/src/compiler/core.ts b/src/compiler/core.ts
index ed9647970c00e..dde1e3d6b57b2 100644
--- a/src/compiler/core.ts
+++ b/src/compiler/core.ts
@@ -21,7 +21,7 @@ module ts {
             get,
             set,
             contains,
-            delete: deleteItem,
+            remove,
             forEachValue: forEachValueInMap
         }
 
@@ -37,7 +37,7 @@ module ts {
             return hasProperty(files, normalizeKey(fileName));
         }
 
-        function deleteItem (fileName: string) {
+        function remove (fileName: string) {
             let key = normalizeKey(fileName);
             delete files[key];
         }
diff --git a/src/compiler/types.ts b/src/compiler/types.ts
index d4e1378772b0c..d03df1c188f86 100644
--- a/src/compiler/types.ts
+++ b/src/compiler/types.ts
@@ -7,7 +7,7 @@ module ts {
         get(fileName: string): T;
         set(fileName: string, value: T): void;
         contains(fileName: string): boolean;
-        delete(fileName: string): void;
+        remove(fileName: string): void;
         forEachValue(f: (v: T) => void): void;
     }
 
diff --git a/src/services/services.ts b/src/services/services.ts
index f579dcca4a5e3..f03dc10007c86 100644
--- a/src/services/services.ts
+++ b/src/services/services.ts
@@ -1990,7 +1990,7 @@ module ts {
 
             Debug.assert(entry.languageServiceRefCount >= 0);
             if (entry.languageServiceRefCount === 0) {
-                bucket.delete(fileName);
+                bucket.remove(fileName);
             }
         }