diff --git a/src/sickle.ts b/src/sickle.ts
index 18361b7e9..937881ac5 100644
--- a/src/sickle.ts
+++ b/src/sickle.ts
@@ -170,6 +170,13 @@ class Annotator {
       case ts.SyntaxKind.EnumDeclaration:
         this.visitEnum(<ts.EnumDeclaration>node);
         break;
+      case ts.SyntaxKind.TypeAssertionExpression:
+        let typeAssertion = <ts.TypeAssertion>node;
+        this.maybeEmitJSDocType(typeAssertion.type);
+        this.emit('(');
+        this.visit(typeAssertion.expression);
+        this.emit(')');
+        break;
       default:
         this.writeNode(node);
         break;
diff --git a/test_files/coerce.ts b/test_files/coerce.ts
new file mode 100644
index 000000000..1afbce35c
--- /dev/null
+++ b/test_files/coerce.ts
@@ -0,0 +1 @@
+let x = 'hello, ' + <string>JSON.parse('"world"');
diff --git a/test_files/es6/coerce.js b/test_files/es6/coerce.js
new file mode 100644
index 000000000..4f7cf90ce
--- /dev/null
+++ b/test_files/es6/coerce.js
@@ -0,0 +1 @@
+let x = 'hello, ' + (JSON.parse('"world"'));
diff --git a/test_files/sickle/coerce.ts b/test_files/sickle/coerce.ts
new file mode 100644
index 000000000..1fe77aca4
--- /dev/null
+++ b/test_files/sickle/coerce.ts
@@ -0,0 +1 @@
+let x = 'hello, ' + /**string */(JSON.parse('"world"'));