diff --git a/docs/src/Usage.md b/docs/src/Usage.md
index 7b9738362d..a2d13af3a9 100644
--- a/docs/src/Usage.md
+++ b/docs/src/Usage.md
@@ -122,7 +122,7 @@ To show the hidden results again, delete `slither.db.json`.
 
 ### Configuration File
 
-Some options can be set through a json configuration file. By default, `slither.config.json` is used if present (it can be changed through `--config-file file.config.json`).
+Some options can be set through a json configuration file. By default, `slither.config.json` is used if present, with `slither.conf.json` accepted as an alternative (it can be changed through `--config-file file.config.json`).
 
 Options passed via the CLI have priority over options set in the configuration file.
 
diff --git a/slither/__main__.py b/slither/__main__.py
index db0c543f05..172c11395b 100644
--- a/slither/__main__.py
+++ b/slither/__main__.py
@@ -608,7 +608,7 @@ def parse_args(
 
     group_misc.add_argument(
         "--config-file",
-        help="Provide a config file (default: slither.config.json)",
+        help="Provide a config file (default: slither.config.json or slither.conf.json)",
         action="store",
         dest="config_file",
         default=None,
diff --git a/slither/tools/slither_format/__main__.py b/slither/tools/slither_format/__main__.py
index 85c0a3917f..177154673b 100644
--- a/slither/tools/slither_format/__main__.py
+++ b/slither/tools/slither_format/__main__.py
@@ -56,10 +56,10 @@ def parse_args() -> argparse.Namespace:
 
     parser.add_argument(
         "--config-file",
-        help="Provide a config file (default: slither.config.json)",
+        help="Provide a config file (default: slither.config.json or slither.conf.json)",
         action="store",
         dest="config_file",
-        default="slither.config.json",
+        default=None,
     )
 
     group_detector = parser.add_argument_group("Detectors")
diff --git a/slither/utils/command_line.py b/slither/utils/command_line.py
index 3242e3aeb1..642889c527 100644
--- a/slither/utils/command_line.py
+++ b/slither/utils/command_line.py
@@ -79,13 +79,17 @@ class FailOnLevel(enum.Enum):
 }
 
 
+DEFAULT_CONFIG_FILENAMES = ("slither.config.json", "slither.conf.json")
+
+
 def read_config_file(args: argparse.Namespace) -> None:
     # No config file was provided as an argument
     if args.config_file is None:
-        # Check whether the default config file is present
-        if os.path.exists("slither.config.json"):
-            # The default file exists, use it
-            args.config_file = "slither.config.json"
+        # Check whether a default config file is present
+        for candidate in DEFAULT_CONFIG_FILENAMES:
+            if os.path.exists(candidate):
+                args.config_file = candidate
+                break
         else:
             return
 
diff --git a/tests/unit/utils/test_command_line.py b/tests/unit/utils/test_command_line.py
new file mode 100644
index 0000000000..bb05e3e007
--- /dev/null
+++ b/tests/unit/utils/test_command_line.py
@@ -0,0 +1,54 @@
+"""Tests for slither/utils/command_line.py"""
+
+import argparse
+import json
+import os
+
+import pytest
+
+from slither.utils.command_line import DEFAULT_CONFIG_FILENAMES, read_config_file
+
+
+@pytest.fixture
+def in_tmp_cwd(tmp_path, monkeypatch):
+    monkeypatch.chdir(tmp_path)
+    return tmp_path
+
+
+def _write_json(path, data):
+    path.write_text(json.dumps(data))
+
+
+def test_read_config_file_autodetects_config_json(in_tmp_cwd):
+    _write_json(in_tmp_cwd / "slither.config.json", {"exclude_low": True})
+    args = argparse.Namespace(config_file=None, exclude_low=False)
+    read_config_file(args)
+    assert args.config_file == "slither.config.json"
+    assert args.exclude_low is True
+
+
+def test_read_config_file_autodetects_conf_json(in_tmp_cwd):
+    _write_json(in_tmp_cwd / "slither.conf.json", {"exclude_low": True})
+    args = argparse.Namespace(config_file=None, exclude_low=False)
+    read_config_file(args)
+    assert args.config_file == "slither.conf.json"
+    assert args.exclude_low is True
+
+
+def test_read_config_file_prefers_config_over_conf(in_tmp_cwd):
+    _write_json(in_tmp_cwd / "slither.config.json", {"exclude_low": True})
+    _write_json(in_tmp_cwd / "slither.conf.json", {"exclude_low": False})
+    args = argparse.Namespace(config_file=None, exclude_low=False)
+    read_config_file(args)
+    assert args.config_file == "slither.config.json"
+    assert args.exclude_low is True
+
+
+def test_read_config_file_no_default_present(in_tmp_cwd):
+    args = argparse.Namespace(config_file=None)
+    read_config_file(args)
+    assert args.config_file is None
+
+
+def test_default_filenames_constant():
+    assert DEFAULT_CONFIG_FILENAMES == ("slither.config.json", "slither.conf.json")