diff --git a/config/puma.rb b/config/puma.rb
index d85b1048..35409fd4 100644
--- a/config/puma.rb
+++ b/config/puma.rb
@@ -56,7 +56,9 @@ prune_bundler
 # Fork all workers from worker 0 to reduce memory footprint and allow phased restarts.
 # For successful phased restarts, we need at least 3 workers (see doc).
 # See https://github.com/puma/puma/blob/master/docs/fork_worker.md.
-fork_worker
+# Passing `0` will disable automatic reforking, which currently breaks with SdNotify.
+# See https://github.com/puma/puma/issues/3273.
+fork_worker 0
 
 # Disable explicit preloading of our app.
 # With `fork_worker`, we will have an implicit preloading.