diff --git a/src/parser/expression.js b/src/parser/expression.js
index 58776bb6f3..cfc8442f91 100644
--- a/src/parser/expression.js
+++ b/src/parser/expression.js
@@ -1125,7 +1125,7 @@ export default class ExpressionParser extends LValParser {
     refShorthandDefaultPos?: ?Pos,
   ): T {
     let decorators = [];
-    const propHash = Object.create(null);
+    const propHash: any = Object.create(null);
     let first = true;
     const node = this.startNode();
 
@@ -1567,7 +1567,7 @@ export default class ExpressionParser extends LValParser {
     }
 
     if (checkLVal) {
-      const nameHash = Object.create(null);
+      const nameHash: any = Object.create(null);
       const oldStrict = this.state.strict;
       if (isStrict) this.state.strict = true;
       if (node.id) {
diff --git a/src/parser/location.js b/src/parser/location.js
index a037632672..f3b0fb656d 100644
--- a/src/parser/location.js
+++ b/src/parser/location.js
@@ -1,6 +1,6 @@
 // @flow
 
-import { getLineInfo } from "../util/location";
+import { getLineInfo, type Position } from "../util/location";
 import CommentsParser from "./comments";
 
 // This function is used to raise exceptions on parse errors. It
diff --git a/src/parser/statement.js b/src/parser/statement.js
index ac1a9f57d9..4145d5e61f 100644
--- a/src/parser/statement.js
+++ b/src/parser/statement.js
@@ -487,7 +487,8 @@ export default class StatementParser extends ExpressionParser {
       if (this.match(tt.parenL)) {
         this.expect(tt.parenL);
         clause.param = this.parseBindingAtom();
-        this.checkLVal(clause.param, true, Object.create(null), "catch clause");
+        const clashes: any = Object.create(null);
+        this.checkLVal(clause.param, true, clashes, "catch clause");
         this.expect(tt.parenR);
       } else {
         this.expectPlugin("optionalCatchBinding");