diff --git a/src/scraplang/parse.cpp b/src/scraplang/parse.cpp
index 4298274..ff3d480 100644
--- a/src/scraplang/parse.cpp
+++ b/src/scraplang/parse.cpp
@@ -94,7 +94,7 @@ namespace duck { namespace sl {
 				xpath_assignment %= identifier >>
 					-(lit("default") >> '(' >> quoted_string >> ')') >> "=" >>
 					as_string[lexeme[+(graph | char_(" \t"))]];
-				identifier %= lexeme[(alpha | char_('_')) >> *(alnum | char_('_'))];
+				identifier %= lexeme[(alpha | char_('_')) >> *(-char_('.') >> +(alnum | char_('_')))];
 
 				apply_block = lit("apply") >> mustache_like_token >> "to" >> source_info >> +eol >>
 					assignment_list >> +eol >> "end";