diff --git a/support/docker/gitpod/Dockerfile b/support/docker/gitpod/Dockerfile
index 8f7223d85..e18c392bf 100644
--- a/support/docker/gitpod/Dockerfile
+++ b/support/docker/gitpod/Dockerfile
@@ -1,5 +1,9 @@
 FROM gitpod/workspace-postgres
 
+# Gitpod will not rebuild PeerTube's dev image unless *some* change is made to this Dockerfile.
+# To trigger a rebuild, simply increase this counter:
+ENV TRIGGER_REBUILD 1
+
 # Install PeerTube's dependencies.
 RUN sudo apt-get update -q && sudo apt-get install -qy \
  ffmpeg \