diff --git a/compiler/cpp/src/generate/t_php_generator.cc b/compiler/cpp/src/generate/t_php_generator.cc
index afadf06..cb2573c 100644
--- a/compiler/cpp/src/generate/t_php_generator.cc
+++ b/compiler/cpp/src/generate/t_php_generator.cc
@@ -219,6 +219,9 @@
     for (v_iter = val.begin(); v_iter != val.end(); ++v_iter) {
       f_consts_ << indent();
       print_const_value(etype, *v_iter);
+      if (type->is_set()) {
+        f_consts_ << " => true";
+      }
       f_consts_ << "," << endl;
     }
     indent_down();
@@ -1337,7 +1340,7 @@
   generate_deserialize_field(out, &felem);
 
   indent(out) <<
-    "$" << prefix << " []= $" << elem << ";" << endl;
+    "$" << prefix << "[$" << elem << "] = true;" << endl;
 }
 
 void t_php_generator::generate_deserialize_list_element(ofstream &out,
@@ -1555,7 +1558,7 @@
     } else if (ttype->is_set()) {
       string iter = tmp("iter");
       indent(out) << 
-        "foreach ($" << prefix << " as $" << iter << ")" << endl;
+        "foreach ($" << prefix << " as $" << iter << " => $true)" << endl;
       scope_up(out);
       generate_serialize_set_element(out, (t_set*)ttype, iter);
       scope_down(out);
diff --git a/compiler/cpp/src/generate/t_py_generator.cc b/compiler/cpp/src/generate/t_py_generator.cc
index bb375cc..bc38296 100644
--- a/compiler/cpp/src/generate/t_py_generator.cc
+++ b/compiler/cpp/src/generate/t_py_generator.cc
@@ -210,6 +210,9 @@
     } else {
       etype = ((t_set*)type)->get_elem_type();
     }
+    if (type->is_set()) {
+      f_consts_ << "set(";
+    }
     f_consts_ << "[" << endl;
     indent_up();
     const vector<t_const_value*>& val = value->get_list();
@@ -221,6 +224,9 @@
     }
     indent_down();
     indent(f_consts_) << "]";
+    if (type->is_set()) {
+      f_consts_ << ")";
+    }
   }
 }
 
@@ -1109,7 +1115,7 @@
       indent() << "(" << ktype << ", " << vtype << ", " << size << " ) = iprot.readMapBegin() " << endl;
   } else if (ttype->is_set()) {
     out <<
-      indent() << prefix << " = []" << endl <<
+      indent() << prefix << " = set()" << endl <<
       indent() << "(" << etype << ", " << size << ") = iprot.readSetBegin()" << endl;
   } else if (ttype->is_list()) {
     out <<
@@ -1175,7 +1181,7 @@
   generate_deserialize_field(out, &felem);
 
   indent(out) <<
-    prefix << ".append(" << elem << ")" << endl;
+    prefix << ".add(" << elem << ")" << endl;
 }
 
 /**
diff --git a/compiler/cpp/src/thrift.l b/compiler/cpp/src/thrift.l
index 0c113cb..a353786 100644
--- a/compiler/cpp/src/thrift.l
+++ b/compiler/cpp/src/thrift.l
@@ -28,6 +28,7 @@
  */
 
 intconstant  ([+-]?[0-9]+)
+hexconstant  ("0x"[0-9A-Fa-f]+)
 dubconstant  ([+-]?[0-9]*(\.[0-9]+)?([eE][+-]?[0-9]+)?)
 identifier   ([a-zA-Z_][\.a-zA-Z_0-9]*)
 whitespace   ([ \t\r\n]*)
@@ -80,6 +81,12 @@
   return tok_int_constant;
 }
 
+{hexconstant} {
+  sscanf(yytext+2, "%x", &yylval.iconst);
+  printf("%d\n", yylval.iconst);
+  return tok_int_constant;
+}
+
 {dubconstant} {
   yylval.dconst = atof(yytext);
   return tok_dub_constant;