diff --git a/ablescript/src/lexer.rs b/ablescript/src/lexer.rs
index 1ac49d6..c622800 100644
--- a/ablescript/src/lexer.rs
+++ b/ablescript/src/lexer.rs
@@ -139,7 +139,7 @@ pub enum Token {
     String(String),
 
     /// Integer
-    #[regex(r"[0-9]+", get_int)]
+    #[regex(r"-?[0-9]+", get_int)]
     Integer(i32),
 
     /// A C-complaint identifier