diff --git a/src/griffe_warnings_deprecated/extension.py b/src/griffe_warnings_deprecated/extension.py
index 201f1ce..0295956 100644
--- a/src/griffe_warnings_deprecated/extension.py
+++ b/src/griffe_warnings_deprecated/extension.py
@@ -2,9 +2,10 @@
 
 from __future__ import annotations
 
+import ast
 from typing import Any
 
-from griffe import Class, Docstring, DocstringSectionAdmonition, Extension, Function, get_logger
+from griffe import Class, Docstring, DocstringSectionAdmonition, ExprCall, Extension, Function, get_logger
 
 logger = get_logger(__name__)
 self_namespace = "griffe_warnings_deprecated"
@@ -15,8 +16,13 @@
 
 def _deprecated(obj: Class | Function) -> str | None:
     for decorator in obj.decorators:
-        if decorator.callable_path in _decorators:
-            return str(decorator.value).split("(", 1)[1].rstrip(")").rsplit(",", 1)[0].lstrip("f")[1:-1]
+        if decorator.callable_path in _decorators and isinstance(decorator.value, ExprCall):
+            first_arg = decorator.value.arguments[0]
+            try:
+                return ast.literal_eval(first_arg)  # type: ignore[arg-type]
+            except ValueError:
+                logger.debug("%s is not a static string", str(first_arg))
+                return None
     return None
 
 
diff --git a/tests/test_extension.py b/tests/test_extension.py
index 39d38ea..c28ee6c 100644
--- a/tests/test_extension.py
+++ b/tests/test_extension.py
@@ -2,6 +2,7 @@
 
 from __future__ import annotations
 
+import logging
 from textwrap import dedent
 
 import pytest
@@ -37,10 +38,6 @@ def hello(): ...
         def hello(): ...
         """,
         """
-        @warnings.deprecated(f"message", category=DeprecationWarning)
-        def hello(): ...
-        """,
-        """
         @warnings.deprecated("message", category=DeprecationWarning)
         def hello():
             '''Summary.'''
@@ -85,3 +82,23 @@ def test_extension(code: str) -> None:
     assert adm.title == "Deprecated"
     assert adm.value.kind == "danger"
     assert adm.value.contents == "message"
+
+
+def test_extension_fstring(caplog: pytest.LogCaptureFixture) -> None:
+    """Test the extension with an f-string as the deprecation message."""
+    code = dedent(
+        """
+        import warnings
+        @warnings.deprecated(f"message")
+        def hello(): ...
+        """,
+    )
+    with (
+        caplog.at_level(logging.DEBUG),
+        temporary_visited_module(code, extensions=load_extensions(WarningsDeprecatedExtension)) as module,
+    ):
+        adm = module["hello"].docstring
+
+    # Expect no deprecation message in the docstring.
+    assert adm is None
+    assert "f'message' is not a static string" in caplog.records[0].message