diff --git a/lib/d/test/thrift_test_client.d b/lib/d/test/thrift_test_client.d
index a258b64..fd53328 100644
--- a/lib/d/test/thrift_test_client.d
+++ b/lib/d/test/thrift_test_client.d
@@ -159,6 +159,8 @@
     if (trace) writefln(" = %s", dub);
     enforce(dub == -5.2098523);
 
+	// TODO: add testBinary() call
+	
     Xtruct out1;
     out1.string_thing = "Zero";
     out1.byte_thing = 1;
diff --git a/lib/d/test/thrift_test_server.d b/lib/d/test/thrift_test_server.d
index 993c063..1608a57 100644
--- a/lib/d/test/thrift_test_server.d
+++ b/lib/d/test/thrift_test_server.d
@@ -81,6 +81,11 @@
     return thing;
   }
 
+  override string testBinary(string thing) {
+    if (trace_) writefln("testBinary(\"%s\")", thing);
+    return thing;
+  }
+
   override Xtruct testStruct(ref const(Xtruct) thing) {
     if (trace_) writefln("testStruct({\"%s\", %s, %s, %s})",
       thing.string_thing, thing.byte_thing, thing.i32_thing, thing.i64_thing);