diff --git a/opengrok-indexer/src/main/java/org/opengrok/indexer/index/IndexerParallelizer.java b/opengrok-indexer/src/main/java/org/opengrok/indexer/index/IndexerParallelizer.java
index 7091862caec..b4994857675 100644
--- a/opengrok-indexer/src/main/java/org/opengrok/indexer/index/IndexerParallelizer.java
+++ b/opengrok-indexer/src/main/java/org/opengrok/indexer/index/IndexerParallelizer.java
@@ -242,13 +242,13 @@ private void createLazyCtagsPool() {
 
     private void createLazyCtagsWatcherExecutor() {
         lzCtagsWatcherExecutor = LazilyInstantiate.using(() ->
-                new ScheduledThreadPoolExecutor(1,
+                new ScheduledThreadPoolExecutor(indexingParallelism,
                         new OpenGrokThreadFactory("ctags-watcher")));
     }
 
     private void createLazyXrefWatcherExecutor() {
         lzXrefWatcherExecutor = LazilyInstantiate.using(() ->
-                new ScheduledThreadPoolExecutor(1,
+                new ScheduledThreadPoolExecutor(indexingParallelism,
                         new OpenGrokThreadFactory("xref-watcher")));
     }