diff --git a/test/cql-pytest/test_compaction_strategy_validation.py b/test/cql-pytest/test_compaction_strategy_validation.py
index 3a80748bb9..4e4025ae5c 100644
--- a/test/cql-pytest/test_compaction_strategy_validation.py
+++ b/test/cql-pytest/test_compaction_strategy_validation.py
@@ -50,6 +50,16 @@ def test_leveled_compaction_strategy_options(cql, table1):
     assert_throws(cql, table1, r"sstable_size_in_mb value \(-5\) must be positive|sstable_size_in_mb must be larger than 0, but was -5", "ALTER TABLE %s WITH compaction = { 'class' : 'LeveledCompactionStrategy', 'sstable_size_in_mb' : -5 }")
 
 def test_not_allowed_options(cql, table1):
-    assert_throws(cql, table1, r"Invalid compaction strategy options {{abc, -54.54}} for chosen strategy type|Properties specified \[abc\] are not understood by SizeTieredCompactionStrategy", "ALTER TABLE %s WITH compaction = { 'class' : 'SizeTieredCompactionStrategy', 'abc' : -54.54 }")
-    assert_throws(cql, table1, r"Invalid compaction strategy options {{dog, 3}} for chosen strategy type|Properties specified \[dog\] are not understood by TimeWindowCompactionStrategy", "ALTER TABLE %s WITH compaction = { 'class' : 'TimeWindowCompactionStrategy', 'dog' : 3 }")
-    assert_throws(cql, table1, r"Invalid compaction strategy options {{compaction_window_size, 4}} for chosen strategy type|Properties specified \[compaction_window_size\] are not understood by LeveledCompactionStrategy", "ALTER TABLE %s WITH compaction = { 'class' : 'LeveledCompactionStrategy', 'compaction_window_size' : 4 }")
+    def scylla_error(**kwargs):
+        template = "Invalid compaction strategy options {{{}}} for chosen strategy type"
+        # TODO: remove the old old_options
+        # {fmt} formats map like  {k1: v1, k2: v2}, while existing operator<<
+        # formatter formats like {{k1, v1}, {k2, v2}}, so cater both formats
+        # before switching to {fmt}'s formatter.
+        old_options = ', '.join(f"{{{k}, {v}}}" for k, v in kwargs.items())
+        options = ', '.join(f"\"{k}\": \"{v}\"" for k, v in kwargs.items())
+        return '|'.join([template.format(old_options), template.format(options)])
+
+    assert_throws(cql, table1, rf"{scylla_error(abc=-54.54)}|Properties specified \[abc\] are not understood by SizeTieredCompactionStrategy", "ALTER TABLE %s WITH compaction = { 'class' : 'SizeTieredCompactionStrategy', 'abc' : -54.54 }")
+    assert_throws(cql, table1, rf"{scylla_error(dog=3)}||Properties specified \[dog\] are not understood by TimeWindowCompactionStrategy", "ALTER TABLE %s WITH compaction = { 'class' : 'TimeWindowCompactionStrategy', 'dog' : 3 }")
+    assert_throws(cql, table1, rf"{scylla_error(compaction_window_size=4)}|Properties specified \[compaction_window_size\] are not understood by LeveledCompactionStrategy", "ALTER TABLE %s WITH compaction = { 'class' : 'LeveledCompactionStrategy', 'compaction_window_size' : 4 }")