diff --git a/airbyte_cdk/sources/declarative/incremental/global_substream_cursor.py b/airbyte_cdk/sources/declarative/incremental/global_substream_cursor.py
index 3b3636236..e67f1f9e1 100644
--- a/airbyte_cdk/sources/declarative/incremental/global_substream_cursor.py
+++ b/airbyte_cdk/sources/declarative/incremental/global_substream_cursor.py
@@ -112,7 +112,9 @@ def stream_slices(self) -> Iterable[StreamSlice]:
         * Yield the last slice. At that point, once there are as many slices yielded as closes, the global slice will be closed too
         """
         slice_generator = (
-            StreamSlice(partition=partition, cursor_slice=cursor_slice)
+            StreamSlice(
+                partition=partition, cursor_slice=cursor_slice, extra_fields=partition.extra_fields
+            )
             for partition in self._partition_router.stream_slices()
             for cursor_slice in self._stream_cursor.stream_slices()
         )
@@ -128,7 +130,9 @@ def stream_slices(self) -> Iterable[StreamSlice]:
 
     def generate_slices_from_partition(self, partition: StreamSlice) -> Iterable[StreamSlice]:
         slice_generator = (
-            StreamSlice(partition=partition, cursor_slice=cursor_slice)
+            StreamSlice(
+                partition=partition, cursor_slice=cursor_slice, extra_fields=partition.extra_fields
+            )
             for cursor_slice in self._stream_cursor.stream_slices()
         )
 
diff --git a/unit_tests/sources/declarative/incremental/test_per_partition_cursor.py b/unit_tests/sources/declarative/incremental/test_per_partition_cursor.py
index 8073b2b12..f689dcf05 100644
--- a/unit_tests/sources/declarative/incremental/test_per_partition_cursor.py
+++ b/unit_tests/sources/declarative/incremental/test_per_partition_cursor.py
@@ -8,6 +8,9 @@
 import pytest
 
 from airbyte_cdk.sources.declarative.incremental.declarative_cursor import DeclarativeCursor
+from airbyte_cdk.sources.declarative.incremental.global_substream_cursor import (
+    GlobalSubstreamCursor,
+)
 from airbyte_cdk.sources.declarative.incremental.per_partition_cursor import (
     PerPartitionCursor,
     PerPartitionKeySerializer,
@@ -715,3 +718,63 @@ def test_per_partition_state_when_set_initial_global_state(
         },
     ]
     assert cursor.get_stream_state()["states"] == expected_state
+
+
+def test_per_partition_cursor_partition_router_extra_fields(
+    mocked_cursor_factory, mocked_partition_router
+):
+    first_partition = {"first_partition_key": "first_partition_value"}
+    mocked_partition_router.stream_slices.return_value = [
+        StreamSlice(
+            partition=first_partition, cursor_slice={}, extra_fields={"extra_field": "extra_value"}
+        ),
+    ]
+    cursor = (
+        MockedCursorBuilder()
+        .with_stream_slices([{CURSOR_SLICE_FIELD: "first slice cursor value"}])
+        .build()
+    )
+
+    mocked_cursor_factory.create.return_value = cursor
+    cursor = PerPartitionCursor(mocked_cursor_factory, mocked_partition_router)
+
+    cursor.set_initial_state({"states": [{"partition": first_partition, "cursor": CURSOR_STATE}]})
+    slices = list(cursor.stream_slices())
+
+    assert slices[0].extra_fields == {"extra_field": "extra_value"}
+    assert slices == [
+        StreamSlice(
+            partition={"first_partition_key": "first_partition_value"},
+            cursor_slice={CURSOR_SLICE_FIELD: "first slice cursor value"},
+            extra_fields={"extra_field": "extra_value"},
+        )
+    ]
+
+
+def test_global_cursor_partition_router_extra_fields(
+    mocked_cursor_factory, mocked_partition_router
+):
+    first_partition = {"first_partition_key": "first_partition_value"}
+    mocked_partition_router.stream_slices.return_value = [
+        StreamSlice(
+            partition=first_partition, cursor_slice={}, extra_fields={"extra_field": "extra_value"}
+        ),
+    ]
+    cursor = (
+        MockedCursorBuilder()
+        .with_stream_slices([{CURSOR_SLICE_FIELD: "first slice cursor value"}])
+        .build()
+    )
+
+    global_cursor = GlobalSubstreamCursor(cursor, mocked_partition_router)
+
+    slices = list(global_cursor.stream_slices())
+
+    assert slices[0].extra_fields == {"extra_field": "extra_value"}
+    assert slices == [
+        StreamSlice(
+            partition=first_partition,
+            cursor_slice={CURSOR_SLICE_FIELD: "first slice cursor value"},
+            extra_fields={"extra_field": "extra_value"},
+        )
+    ]