diff --git a/compiler/cpp/src/generate/t_java_generator.cc b/compiler/cpp/src/generate/t_java_generator.cc
index 2941a39..e9f1c73 100644
--- a/compiler/cpp/src/generate/t_java_generator.cc
+++ b/compiler/cpp/src/generate/t_java_generator.cc
@@ -923,6 +923,7 @@
     if (optional) {
       out <<
         indent() << "if (this.__isset." << (*f_iter)->get_name() << ") {" << endl;
+      indent_up();
     }
 
     out <<