1 files changed, 1 insertions, 1 deletions
diff --git a/lexer.l b/lexer.l
index 56b33e6..644512e 100644
--- a/lexer.l
+++ b/lexer.l
@@ -51,7 +51,7 @@ extern const char *parser_input_buffer;
 "false"		return TOK_FALSE;
 "undef"		return TOK_UNDEF;
 
-[0-9][0-9.]* { parserlval.number = atof(yytext); return TOK_NUMBER; }
+[+-]?[0-9][0-9.]* { parserlval.number = atof(yytext); return TOK_NUMBER; }
 [a-zA-Z0-9_]+ { parserlval.text = strdup(yytext); return TOK_ID; }
 \"[^"]*\" { parserlval.text = strdup(yytext); return TOK_STRING; }