diff --git a/src/plugins/flow.js b/src/plugins/flow.js
index 7c85da6255..9e6caca3db 100644
--- a/src/plugins/flow.js
+++ b/src/plugins/flow.js
@@ -505,6 +505,8 @@ pp.flowParsePrimaryType = function () {
         node.returnType = this.flowParseType();
 
         return this.finishNode(node, "FunctionTypeAnnotation");
+      } else {
+        this.unexpected();
       }
 
     case tt.parenL:
diff --git a/test/fixtures/flow/type-annotations/106/actual.js b/test/fixtures/flow/type-annotations/106/actual.js
new file mode 100644
index 0000000000..0a8290512d
--- /dev/null
+++ b/test/fixtures/flow/type-annotations/106/actual.js
@@ -0,0 +1 @@
+var f: >x:int) => string;
diff --git a/test/fixtures/flow/type-annotations/106/options.json b/test/fixtures/flow/type-annotations/106/options.json
new file mode 100644
index 0000000000..c958665c03
--- /dev/null
+++ b/test/fixtures/flow/type-annotations/106/options.json
@@ -0,0 +1,3 @@
+{
+  "throws": "Unexpected token (1:7)"
+}