diff --git a/usr.sbin/autofs/token.l b/usr.sbin/autofs/token.l
index 5062a137a23a..6a92b7f13b8f 100644
--- a/usr.sbin/autofs/token.l
+++ b/usr.sbin/autofs/token.l
@@ -49,7 +49,7 @@ extern int	yylex(void);
 
 %%
 \"[^"]+\"		{ yytext++; yytext[strlen(yytext) - 1] = '\0'; return STR; };
-[a-zA-Z0-9\.\+-_/\:\[\]$&{}]+ { return STR; }
+[a-zA-Z0-9\.\+-_/\:\[\]$&%{}]+ { return STR; }
 #.*\n			{ lineno++; return NEWLINE; };
 \\\n			{ lineno++; };
 \n			{ lineno++; return NEWLINE; }