diff --git a/src/fast-path.js b/src/fast-path.js
index a531a96f..15021084 100644
--- a/src/fast-path.js
+++ b/src/fast-path.js
@@ -392,6 +392,7 @@ FPp.needsParens = function(assumeExpressionContext) {
         case "LogicalExpression":
         case "LogicalExpression":
         case "NewExpression":
+        case "ExportDefaultDeclaration":
           return true;
 
         case "CallExpression":
diff --git a/tests/export_default/__snapshots__/jsfmt.spec.js.snap b/tests/export_default/__snapshots__/jsfmt.spec.js.snap
index 7a5c5da5..ac0cace2 100644
--- a/tests/export_default/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/export_default/__snapshots__/jsfmt.spec.js.snap
@@ -5,6 +5,13 @@ module.exports = require(\"M\");
 "
 `;
 
+exports[`test body.js 1`] = `
+"export default (class {}[1] = 1);
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+export default (class {}[1] = 1);
+"
+`;
+
 exports[`test test.js 1`] = `
 "var M = require(\'M\');
 var N = require(\'N\');
diff --git a/tests/export_default/body.js b/tests/export_default/body.js
new file mode 100644
index 00000000..7a2f3c47
--- /dev/null
+++ b/tests/export_default/body.js
@@ -0,0 +1 @@
+export default (class {}[1] = 1);