diff --git a/tools/watch.sh b/tools/watch.sh
index 5e8defa49c..8c63d44b59 100644
--- a/tools/watch.sh
+++ b/tools/watch.sh
@@ -1,8 +1,13 @@
 #!/bin/bash
 set -euo pipefail
 
-make --no-print-directory watch-frontend &
-make --no-print-directory watch-backend &
+make --no-print-directory watch-frontend | tee >(
+  awk -v pattern="webpack" '
+    $0 ~ pattern {
+      system("make --no-print-directory watch-backend &")
+    }
+  '
+) &
 
 trap 'kill $(jobs -p)' EXIT
 wait