diff --git a/blackarrow/blackarrow.py b/blackarrow/blackarrow.py
index ccbec18..ae55beb 100755
--- a/blackarrow/blackarrow.py
+++ b/blackarrow/blackarrow.py
@@ -61,20 +61,22 @@ def start_search(args: argparse.Namespace):
     final_queue = mp.Queue()  # Use final queue for external output
     processes = []
 
-    indexer = mp.Process(
-        name="indexer",
-        target=index_worker,
-        args=(
-            args.directories,
-            ignore_re,
-            filename_re,
-            numworkers,
-            search_queue,
-            args.depth,
-        ),
-    )
-    indexer.start()
-    processes.append(indexer)
+    for i, directory in enumerate(args.directories):
+        depth = None if args.depth is None else args.depth + directory.count(os.sep)
+        indexer = mp.Process(
+            name="indexer-{}".format(i+1),
+            target=index_worker,
+            args=(
+                [directory],
+                ignore_re,
+                filename_re,
+                numworkers,
+                search_queue,
+                depth,
+            ),
+        )
+        indexer.start()
+        processes.append(indexer)
 
     for i in range(numworkers):
         worker = mp.Process(