diff --git a/conf/cf-lex.l b/conf/cf-lex.l
index 188d5362..22f02959 100644
--- a/conf/cf-lex.l
+++ b/conf/cf-lex.l
@@ -139,7 +139,7 @@ WHITE [ \t]
   return CLI_MARKER;
 }
 
-[={}:;,()+*/%-<>~\[\]?] {
+[={}:;,.()+*/%<>~\[\]?!-] {
   return yytext[0];
 }