diff --git a/src/java/org/apache/lucene/queryParser/QueryParser.jj b/src/java/org/apache/lucene/queryParser/QueryParser.jj
index a25d004fc17..02ea937f3f2 100644
--- a/src/java/org/apache/lucene/queryParser/QueryParser.jj
+++ b/src/java/org/apache/lucene/queryParser/QueryParser.jj
@@ -506,7 +506,7 @@ PARSER_END(QueryParser)
 }
 
 <Boost> TOKEN : {
-<NUMBER:    (["+","-"])?   (<_NUM_CHAR>)+ ( "." (<_NUM_CHAR>)+ )? > : DEFAULT
+<NUMBER:    (<_NUM_CHAR>)+ ( "." (<_NUM_CHAR>)+ )? > : DEFAULT
 }
 
 <RangeIn> TOKEN : {