diff --git a/logtools/log/sources/transform/lookahead_source.py b/logtools/log/sources/transform/lookahead_source.py
index a389ff9..ef64a78 100644
--- a/logtools/log/sources/transform/lookahead_source.py
+++ b/logtools/log/sources/transform/lookahead_source.py
@@ -1,6 +1,6 @@
 from typing import Optional, Iterator
 
-from logtools.log.base import LogSource, TLocation, RawLogLine, TLogLine
+from logtools.log.base import LogSource, TLogLine
 
 
 class LookAheadSource(LogSource[TLogLine]):
diff --git a/logtools/log/sources/transform/tests/test_collating_source.py b/logtools/log/sources/transform/tests/test_collating_source.py
index 745d37e..2e76d7e 100644
--- a/logtools/log/sources/transform/tests/test_collating_source.py
+++ b/logtools/log/sources/transform/tests/test_collating_source.py
@@ -1,6 +1,6 @@
+from logtools.log.sources.input.string_log_source import StringLogSource
 from logtools.log.sources.parse.chronicles_raw_source import ChroniclesRawSource
 from logtools.log.sources.transform.collating_source import CollatingSource
-from logtools.log.sources.input.string_log_source import StringLogSource
 
 
 def test_should_collate_lines_from_log_sources():
diff --git a/logtools/log/sources/transform/tests/test_filtered_source.py b/logtools/log/sources/transform/tests/test_filtered_source.py
index 6b180a0..a1c1f2a 100644
--- a/logtools/log/sources/transform/tests/test_filtered_source.py
+++ b/logtools/log/sources/transform/tests/test_filtered_source.py
@@ -1,8 +1,8 @@
 from dateutil import parser
 
+from logtools.log.sources.input.string_log_source import StringLogSource
 from logtools.log.sources.parse.chronicles_raw_source import ChroniclesRawSource
 from logtools.log.sources.transform.filtered_source import FilteredSource, timestamp_range
-from logtools.log.sources.input.string_log_source import StringLogSource
 
 
 def test_should_filter_by_matching_predicate():
diff --git a/logtools/log/sources/transform/tests/test_lookahead_source.py b/logtools/log/sources/transform/tests/test_lookahead_source.py
index 22cc73b..f8ff1b1 100644
--- a/logtools/log/sources/transform/tests/test_lookahead_source.py
+++ b/logtools/log/sources/transform/tests/test_lookahead_source.py
@@ -1,6 +1,6 @@
+from logtools.log.sources.input.string_log_source import StringLogSource
 from logtools.log.sources.parse.chronicles_raw_source import ChroniclesRawSource
 from logtools.log.sources.transform.lookahead_source import LookAheadSource
-from logtools.log.sources.input.string_log_source import StringLogSource
 
 
 def test_should_allow_peeking_at_the_head_of_log():
diff --git a/logtools/log/sources/transform/tests/test_merged_source.py b/logtools/log/sources/transform/tests/test_merged_source.py
index b63cd3c..a81291b 100644
--- a/logtools/log/sources/transform/tests/test_merged_source.py
+++ b/logtools/log/sources/transform/tests/test_merged_source.py
@@ -1,7 +1,7 @@
+from logtools.log.sources.input.string_log_source import StringLogSource
 from logtools.log.sources.parse.chronicles_raw_source import ChroniclesRawSource
 from logtools.log.sources.transform.merged_source import MergedSource
 from logtools.log.sources.transform.ordered_source import OrderedSource
-from logtools.log.sources.input.string_log_source import StringLogSource
 
 
 def test_should_merge_logs_by_timestamp():
diff --git a/logtools/log/sources/transform/tests/test_ordered_source.py b/logtools/log/sources/transform/tests/test_ordered_source.py
index 9c1a4af..9660cc7 100644
--- a/logtools/log/sources/transform/tests/test_ordered_source.py
+++ b/logtools/log/sources/transform/tests/test_ordered_source.py
@@ -1,8 +1,8 @@
 import pytest
 
+from logtools.log.sources.input.string_log_source import StringLogSource
 from logtools.log.sources.parse.chronicles_raw_source import ChroniclesRawSource
 from logtools.log.sources.transform.ordered_source import OrderedSource
-from logtools.log.sources.input.string_log_source import StringLogSource
 
 
 def test_should_order_sources_by_lookahead_timestamp():