diff --git a/plare/lexer.py b/plare/lexer.py
index 99bc024..f7fa2f8 100644
--- a/plare/lexer.py
+++ b/plare/lexer.py
@@ -69,11 +69,13 @@ def lex(self, var: str, src: str) -> Generator[Token]:
                                 yield from token
                             case _:
                                 var = token
-                newlines = matched.count("\n")
-                lineno += newlines
-                if newlines > 0:
+                matched_lines = matched.split("\n")
+                n_matched_new_lines = len(matched_lines) - 1
+                lineno += n_matched_new_lines
+                if n_matched_new_lines > 0:
                     offset = 0
-                offset = len(matched) - matched.rfind("\n")
+                last_matched_line = matched_lines[-1]
+                offset += len(last_matched_line)
                 break
             else:
                 if len(src) == 0:
diff --git a/tests/test_lexer.py b/tests/test_lexer.py
index 6a9aa30..45a4b4f 100644
--- a/tests/test_lexer.py
+++ b/tests/test_lexer.py
@@ -118,3 +118,27 @@ def test_lex_multiple_tokens_for_single_match():
     assert isinstance(tokens[2], SPACE)
     assert tokens[2].lineno == 1
     assert tokens[2].offset == 2
+
+
+class EOF(Token):
+    pass
+
+
+def test_lex_end_of_file():
+    lexer = Lexer(
+        {
+            "start": [
+                (r"\d+", NUM),
+                (r"$", EOF),
+            ]
+        }
+    )
+    tokens = list(lexer.lex("start", "123"))
+    assert len(tokens) == 2
+    assert isinstance(tokens[0], NUM)
+    assert tokens[0].value == 123
+    assert tokens[0].lineno == 1
+    assert tokens[0].offset == 0
+    assert isinstance(tokens[1], EOF)
+    assert tokens[1].lineno == 1
+    assert tokens[1].offset == 3