diff --git a/parser.leg b/parser.leg
index d4773e2..0287572 100644
--- a/parser.leg
+++ b/parser.leg
@@ -436,7 +436,7 @@ Space = Spacechar+
         { $$ = mk_str(" ")
           $$.key = SPACE }
 
-Str = < NormalChar (NormalChar | '_'+ &NormalChar)* >
+Str = < NormalChar (NormalChar | '_'+ &Alphanumeric)* >
         { $$ = mk_str(yytext) }
 
 EscapedChar =   '\\' !Newline < [-\\`|*_{}[\]()#+.!><] >
diff --git a/parser.leg.go b/parser.leg.go
index 4d7aac5..48025fa 100644
--- a/parser.leg.go
+++ b/parser.leg.go
@@ -7388,7 +7388,7 @@ func (p *yyParser) Init() {
 			position, thunkPosition = position0, thunkPosition0
 			return false
 		},
-		/* 106 Str <- (< NormalChar (NormalChar / ('_'+ &NormalChar))* > { yy = mk_str(yytext) }) */
+		/* 106 Str <- (< NormalChar (NormalChar / ('_'+ &Alphanumeric))* > { yy = mk_str(yytext) }) */
 		func() bool {
 			position0, thunkPosition0 := position, thunkPosition
 			begin = position
@@ -7421,7 +7421,7 @@ func (p *yyParser) Init() {
 					}
 					{
 						position764, thunkPosition764 := position, thunkPosition
-						if !p.rules[ruleNormalChar]() {
+						if !p.rules[ruleAlphanumeric]() {
 							goto l759
 						}
 						position, thunkPosition = position764, thunkPosition764