diff --git a/Tests/scs-compliance-check.py b/Tests/scs-compliance-check.py
index 4598d5fb9..e218bdecc 100755
--- a/Tests/scs-compliance-check.py
+++ b/Tests/scs-compliance-check.py
@@ -334,7 +334,7 @@ def main(argv):
     # collect scripts to be run
     testcase_lookup = spec['testcases']
     tc_script_lookup = spec['tc_scripts']
-    script_info = {}
+    script_tc_ids = [[] for _ in spec['scripts']]
     for tc_id in all_testcase_ids:
         script = tc_script_lookup[tc_id]
         if 'executable' not in script:
@@ -343,16 +343,13 @@ def main(argv):
             continue
         if config.tests and not config.tests.match(tc_id):
             continue
-        item = script_info.get(id(script))
-        if item is None:
-            _, testcase_ids = script_info[id(script)] = (script, [])
-        else:
-            _, testcase_ids = item
-        testcase_ids.append(tc_id)
+        idx = script['_idx']
+        script_tc_ids[idx].append(tc_id)
     # run scripts
     invocations = [
-        runner.run(script, testcases=sorted(testcases))
-        for script, testcases in script_info.values()
+        runner.run(script, testcases=sorted(tc_ids))
+        for script, tc_ids in zip(spec['scripts'], script_tc_ids)
+        if tc_ids
     ]
     results = {}
     for invocation in invocations:
diff --git a/Tests/scs_cert_lib.py b/Tests/scs_cert_lib.py
index 00d8fcd77..d7a54de85 100644
--- a/Tests/scs_cert_lib.py
+++ b/Tests/scs_cert_lib.py
@@ -59,7 +59,8 @@ def _resolve_spec(spec: dict):
     # step 1. build lookups
     testcase_lookup = {}
     tc_script_lookup = {}
-    for script in spec.get('scripts', ()):
+    for idx, script in enumerate(spec.get('scripts', ())):
+        script['_idx'] = idx
         for testcase in script.get('testcases', ()):
             id_ = testcase['id']
             if id_ in testcase_lookup: