diff --git a/types/acorn/index.d.ts b/types/acorn/index.d.ts
index c82c24fa23..5d02bd716c 100644
--- a/types/acorn/index.d.ts
+++ b/types/acorn/index.d.ts
@@ -228,9 +228,8 @@ declare namespace acorn {
 
     const version: string;
 
-    interface IParse {
-        (input: string, options?: Options): ESTree.Program;
-    }
+    // TODO: rename type.
+    type IParse = (input: string, options?: Options) => ESTree.Program;
 
     const parse: IParse;
 
diff --git a/types/acorn/tslint.json b/types/acorn/tslint.json
index 9ca4ce24d0..2d05b8507c 100644
--- a/types/acorn/tslint.json
+++ b/types/acorn/tslint.json
@@ -1,7 +1,6 @@
 {
     "extends": "dtslint/dt.json",
     "rules": {
-        "callable-types": false,
         "export-just-namespace": false,
         "interface-name": false,
         "no-empty-interface": false,