diff --git a/aider/watch.py b/aider/watch.py
index 5dd770976..e7b115730 100644
--- a/aider/watch.py
+++ b/aider/watch.py
@@ -64,7 +64,7 @@ class FileWatcher:
     """Watches source files for changes and AI comments"""
 
     # Compiled regex pattern for AI comments
-    ai_comment_pattern = re.compile(r"(?:#|//|--) *(ai\b.*|ai\b.*|.*\bai[?!]?) *$", re.IGNORECASE)
+    ai_comment_pattern = re.compile(r"(?:#|//|--|;+) *(ai\b.*|ai\b.*|.*\bai[?!]?) *$", re.IGNORECASE)
 
     def __init__(self, coder, gitignores=None, verbose=False, analytics=None, root=None):
         self.coder = coder
@@ -262,7 +262,7 @@ class FileWatcher:
                     line_nums.append(i)
                     comments.append(comment)
                     comment = comment.lower()
-                    comment = comment.lstrip("/#-")
+                    comment = comment.lstrip("/#-;")  # Added semicolon for Lisp comments
                     comment = comment.strip()
                     if comment.startswith("ai!") or comment.endswith("ai!"):
                         has_action = "!"
diff --git a/tests/basic/test_watch.py b/tests/basic/test_watch.py
index 706fd1ade..524f80e08 100644
--- a/tests/basic/test_watch.py
+++ b/tests/basic/test_watch.py
@@ -155,3 +155,12 @@ def test_ai_comment_pattern():
     assert (
         question_js_has_bang == "?"
     ), "Expected at least one bang (!) comment in watch_question.js fixture"
+    
+    # Test Lisp fixture
+    lisp_path = fixtures_dir / "watch.lisp"
+    lisp_lines, lisp_comments, lisp_has_bang = watcher.get_ai_comments(str(lisp_path))
+    lisp_expected = 7
+    assert (
+        len(lisp_lines) == lisp_expected
+    ), f"Expected {lisp_expected} AI comments in Lisp fixture, found {len(lisp_lines)}"
+    assert lisp_has_bang == "!", "Expected at least one bang (!) comment in Lisp fixture"
diff --git a/tests/fixtures/watch.lisp b/tests/fixtures/watch.lisp
new file mode 100644
index 000000000..1aae8fb8f
--- /dev/null
+++ b/tests/fixtures/watch.lisp
@@ -0,0 +1,19 @@
+(defun hello-world ()
+  ;; ai this is a simple hello world function
+  (format t "Hello, World!"))
+
+(defun add (a b)
+  ; ai! fix this function to handle nil values
+  (+ a b))
+
+(defun multiply (a b)
+  ;;; ai? why is this function not working with large numbers?
+  (* a b))
+
+; ai this is a single semicolon comment
+
+;; ai this is a double semicolon comment
+
+;;; ai this is a triple semicolon comment
+
+;;;; ai! this is a quadruple semicolon comment