diff --git a/src/lexer/mod.rs b/src/lexer/mod.rs
index 8f4bb09..d1c6d2d 100644
--- a/src/lexer/mod.rs
+++ b/src/lexer/mod.rs
@@ -139,6 +139,10 @@ impl Lexer {
             self.advance();
             *token = Some(Token::Boolean(c.is_boolean_true()));
         }
+        else if c.is_left_paren() {
+            self.advance();
+            *token = Some(Token::LeftVectorParen);
+        }
     }
 
     fn state_string(&mut self, c: char, token: &mut Option<Token>) {
@@ -208,6 +212,7 @@ mod tests {
     fn lexer_finds_parens() {
         check_single_token("(", Token::LeftParen(String::from("(")));
         check_single_token(")", Token::RightParen(String::from(")")));
+        check_single_token("#(", Token::LeftVectorParen);
     }
 
     #[test]
diff --git a/src/lexer/token.rs b/src/lexer/token.rs
index ab66c69..c56b6ca 100644
--- a/src/lexer/token.rs
+++ b/src/lexer/token.rs
@@ -6,6 +6,7 @@
 #[derive(PartialEq)]
 pub enum Token {
     LeftParen(String),
+    LeftVectorParen,
     RightParen(String),
     Dot,
     Identifier(String),