diff --git a/AUTHORS.rst b/AUTHORS.rst
index 9a8224dc7d..6fc80f05ce 100644
--- a/AUTHORS.rst
+++ b/AUTHORS.rst
@@ -102,6 +102,7 @@ The following organizations or individuals have contributed to ScanCode:
 - Vibhu Agarwal @Vibhu-Agarwal
 - Viktor Tiulpin @tiulpin
 - Vinay Kumar Singh @Vinay0001
+- w3lld1 @w3lld1
 - Virag Umathe @viragumathe5
 - Yash D. Saraf @yashdsaraf
 - Yash Nisar @yash-nisar
diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index d9a5a6b402..1472f7877e 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -4,6 +4,9 @@ Changelog
 Next release
 --------------
 
+- Ensure each license rule has a unique generated validation test name.
+  https://github.com/aboutcode-org/scancode-toolkit/issues/5257
+
 - Fix the optional ``licenses`` extra dependency typo to install
   ``licensedcode-data``.
   https://github.com/aboutcode-org/scancode-toolkit/pull/5056
diff --git a/src/licensedcode/data/rules/cnri-python-1.6_1.RULE b/src/licensedcode/data/rules/cnri-python-1.6_19.RULE
similarity index 100%
rename from src/licensedcode/data/rules/cnri-python-1.6_1.RULE
rename to src/licensedcode/data/rules/cnri-python-1.6_19.RULE
diff --git a/src/licensedcode/data/rules/proprietary_10.RULE b/src/licensedcode/data/rules/proprietary_155.RULE
similarity index 100%
rename from src/licensedcode/data/rules/proprietary_10.RULE
rename to src/licensedcode/data/rules/proprietary_155.RULE
diff --git a/tests/licensedcode/test_detect.py b/tests/licensedcode/test_detect.py
index 5dbf7b369b..a1475c390f 100644
--- a/tests/licensedcode/test_detect.py
+++ b/tests/licensedcode/test_detect.py
@@ -1075,8 +1075,8 @@ def test_match_has_correct_line_positions_in_automake_perl_file(self):
         expected = [
             # detected, match.lines(), match.qspan,
             ('gpl-2.0-plus', (12, 25), Span(51, 160)),
-            ('fsf-unlimited-no-warranty', (231, 238), Span(986, 1049)),
-            ('warranty-disclaimer', (306, 307), Span(1359, 1381)),
+            ('fsf-unlimited-no-warranty', (231, 238), Span(998, 1061)),
+            ('warranty-disclaimer', (306, 307), Span(1371, 1393)),
         ]
         self.check_position('positions/automake.pl', expected)
 
diff --git a/tests/licensedcode/test_rule_file_names.py b/tests/licensedcode/test_rule_file_names.py
new file mode 100644
index 0000000000..1f6adc8e54
--- /dev/null
+++ b/tests/licensedcode/test_rule_file_names.py
@@ -0,0 +1,32 @@
+#
+# Copyright (c) nexB Inc. and others. All rights reserved.
+# ScanCode is a trademark of nexB Inc.
+# SPDX-License-Identifier: Apache-2.0
+# See http://www.apache.org/licenses/LICENSE-2.0 for the license text.
+# See https://github.com/nexB/scancode-toolkit for support or download.
+# See https://aboutcode.org for more information about nexB OSS projects.
+#
+
+from collections import defaultdict
+from pathlib import Path
+
+from commoncode.text import python_safe_name
+
+
+RULES_DATA_DIR = Path(__file__).parents[2] / "src" / "licensedcode" / "data" / "rules"
+
+
+def test_rule_file_names_generate_unique_python_names():
+    rule_names_by_python_name = defaultdict(list)
+
+    for rule_file in RULES_DATA_DIR.glob("*.RULE"):
+        python_name = python_safe_name(rule_file.name)
+        rule_names_by_python_name[python_name].append(rule_file.name)
+
+    duplicate_names = {
+        python_name: sorted(rule_names)
+        for python_name, rule_names in rule_names_by_python_name.items()
+        if len(rule_names) > 1
+    }
+
+    assert not duplicate_names, duplicate_names