diff --git a/dyn/config_lexer.cc b/dyn/config_lexer.cc
index 3d5ac197b..f1fc33e99 100644
--- a/dyn/config_lexer.cc
+++ b/dyn/config_lexer.cc
@@ -402,7 +402,7 @@ static yyconst flex_int32_t yy_ec[256] =
        11,    1,    1,    1,   12,   12,   12,   12,   12,   12,
        12,   12,   12,   12,   12,   12,   12,   12,   12,   12,
        12,   12,   12,   12,   12,   12,   12,   12,   12,   12,
-        1,    1,    1,    1,    1,    1,   13,   14,   15,   16,
+        1,    1,    1,    1,   12,    1,   13,   14,   15,   16,
 
        17,   12,   12,   18,   19,   20,   12,   21,   12,   22,
        23,   12,   12,   24,   25,   26,   27,   12,   12,   12,
diff --git a/dyn/config_lexer.ll b/dyn/config_lexer.ll
index 80918a695..56166a04e 100644
--- a/dyn/config_lexer.ll
+++ b/dyn/config_lexer.ll
@@ -52,7 +52,7 @@ object				return T_OBJECT;
 include				return T_INCLUDE;
 inherits			return T_INHERITS;
 null				return T_NULL;
-[a-zA-Z][a-zA-Z0-9\-]*	{ yylval->text = strdup(yytext); return T_IDENTIFIER; }
+[a-zA-Z_][a-zA-Z0-9\-_]*	{ yylval->text = strdup(yytext); return T_IDENTIFIER; }
 \"[^\"]+\"			{ yytext[yyleng-1] = '\0'; yylval->text = strdup(yytext + 1); return T_STRING; }
 [0-9]+				{ yylval->num = atoi(yytext); return T_NUMBER; }
 =				{ yylval->op = OperatorSet; return T_EQUAL; }