diff --git a/compiler/cpp/src/thriftl.ll b/compiler/cpp/src/thriftl.ll
index c563f75..2a824d1 100644
--- a/compiler/cpp/src/thriftl.ll
+++ b/compiler/cpp/src/thriftl.ll
@@ -119,6 +119,7 @@
 "oneway"             { return tok_oneway;               }
 "typedef"            { return tok_typedef;              }
 "struct"             { return tok_struct;               }
+"union"              { return tok_union;                }
 "exception"          { return tok_xception;             }
 "extends"            { return tok_extends;              }
 "throws"             { return tok_throws;               }
@@ -197,7 +198,6 @@
 "volatile"           { thrift_reserved_keyword(yytext); }
 "while"              { thrift_reserved_keyword(yytext); }
 "with"               { thrift_reserved_keyword(yytext); }
-"union"              { thrift_reserved_keyword(yytext); }
 "yield"              { thrift_reserved_keyword(yytext); }
 
 {intconstant} {