diff --git a/tests/integration/subchunkable/specs/exc/test_uint8_exc_skip_intermediaries_but_reduction_worker_type.cue b/tests/integration/subchunkable/specs/exc/test_uint8_exc_skip_intermediaries_but_reduction_worker_type.cue
new file mode 100644
index 000000000..23fa003e3
--- /dev/null
+++ b/tests/integration/subchunkable/specs/exc/test_uint8_exc_skip_intermediaries_but_reduction_worker_type.cue
@@ -0,0 +1,39 @@
+#SRC_PATH: "assets/inputs/fafb_v15_img_128_128_40-2048-3072_2000-2050_uint8"
+#DST_PATH: "assets/outputs/test_uint8_exc_skip_intermediaries_but_reduction_worker_type"
+
+#BBOX: {
+	"@type": "BBox3D.from_coords"
+	start_coord: [64 * 1024, 64 * 1024, 2000]
+	end_coord: [96 * 1024, 96 * 1024, 2005]
+	resolution: [4, 4, 40]
+}
+
+#FLOW: {
+	"@type": "build_subchunkable_apply_flow"
+	fn: {
+		"@type":    "lambda"
+		lambda_str: "lambda src: src"
+	}
+	processing_chunk_sizes: [[1024, 1024, 1], [512, 512, 1]]
+	processing_crop_pads: [[0, 0, 0], [0, 0, 0]]
+	processing_blend_pads: [[0, 0, 0], [0, 0, 0]]
+	skip_intermediaries:    true
+	expand_bbox_processing: true
+	dst_resolution: [128, 128, 40]
+	bbox: #BBOX
+	op_kwargs: {
+		src: {
+			"@type": "build_cv_layer"
+			path:    #SRC_PATH
+		}
+	}
+	dst: {
+		"@type":             "build_cv_layer"
+		path:                #DST_PATH
+		info_reference_path: #SRC_PATH
+	}
+    reduction_worker_type: "some_worker_type"
+}
+
+"@type": "mazepa.execute"
+target:  #FLOW
diff --git a/tests/integration/subchunkable/test_subchunkable.py b/tests/integration/subchunkable/test_subchunkable.py
index 8c2e18c3e..9e29b1964 100644
--- a/tests/integration/subchunkable/test_subchunkable.py
+++ b/tests/integration/subchunkable/test_subchunkable.py
@@ -165,6 +165,7 @@ def test_subchunkable(cue_name, clear_temp_dir_and_info_cache):
         "test_uint8_exc_skip_intermediaries_but_blend_pad",
         "test_uint8_exc_skip_intermediaries_but_crop_pad",
         "test_uint8_exc_skip_intermediaries_but_defer",
+        "test_uint8_exc_skip_intermediaries_but_reduction_worker_type",
         "test_uint8_exc_not_skip_intermediaries_but_no_level_intermediaries_dirs",
         "test_uint8_exc_shrink_processing_chunk_and_expand_bbox_processing",
         "test_uint8_exc_bbox_non_integral_without_expand_bbox_resolution",
diff --git a/zetta_utils/mazepa_layer_processing/common/subchunkable_apply_flow.py b/zetta_utils/mazepa_layer_processing/common/subchunkable_apply_flow.py
index 419e941dd..829048ac6 100644
--- a/zetta_utils/mazepa_layer_processing/common/subchunkable_apply_flow.py
+++ b/zetta_utils/mazepa_layer_processing/common/subchunkable_apply_flow.py
@@ -476,6 +476,10 @@ def build_subchunkable_apply_flow(  # pylint: disable=keyword-arg-before-vararg,
         max_reduction_chunk_size_ = max_reduction_chunk_size
 
     if skip_intermediaries:
+        if reduction_worker_type is not None:
+            raise ValueError(
+                "`reduction_worker_type` cannot be used when `skip_intermediaries` is True."
+            )
         if level_intermediaries_dirs is not None:
             raise ValueError(
                 "`level_intermediaries_dirs` was supplied even though "