diff --git a/src/printer.js b/src/printer.js
index 705bb5359..2e99a8beb 100644
--- a/src/printer.js
+++ b/src/printer.js
@@ -2204,7 +2204,8 @@ function printFunctionParams(path, print, options) {
   //   b,
   //   c
   // }) {}
-  if (fun.params.length === 1 &&
+  if (fun.params &&
+    fun.params.length === 1 &&
     !fun.params[0].comments &&
     (fun.params[0].type === "ObjectPattern" ||
       fun.params[0].type === "FunctionTypeParam" &&
diff --git a/tests/flow_object_comment/__snapshots__/jsfmt.spec.js.snap b/tests/flow_object_comment/__snapshots__/jsfmt.spec.js.snap
index 1314cca0a..870d6ba15 100644
--- a/tests/flow_object_comment/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow_object_comment/__snapshots__/jsfmt.spec.js.snap
@@ -13,16 +13,14 @@ exports[`flow_object_comment.js 1`] = `
   },
 ) => {}
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-export default (
-  {
-    foo,
-    bar
-  }: {
-    // comment
-    foo?: Object,
-    // comment 2
-    bar?: Object
-  }
-) => {};
+export default ({
+  foo,
+  bar
+}: {
+  // comment
+  foo?: Object,
+  // comment 2
+  bar?: Object
+}) => {};
 "
 `;