diff --git a/lib/rb/spec/ThriftSpec.thrift b/lib/rb/spec/ThriftSpec.thrift
index b497a60..e4dece4 100644
--- a/lib/rb/spec/ThriftSpec.thrift
+++ b/lib/rb/spec/ThriftSpec.thrift
@@ -59,6 +59,7 @@
   2: i32 i32_field;
   3: i32 other_i32_field;
   4: SomeEnum enum_field;
+  5: binary binary_field;
 }
 
 struct Foo {
@@ -72,6 +73,10 @@
   8: bool my_bool
 }
 
+struct Foo2 {
+  1: binary my_binary
+}
+
 struct BoolStruct {
   1: bool yesno = 1
 }