2 files changed, 2 insertions, 0 deletions
diff --git a/changelog.d/xxxx.misc b/changelog.d/xxxx.misc
new file mode 100644
index 0000000000..5f9dcc94bd
--- /dev/null
+++ b/changelog.d/xxxx.misc
@@ -0,0 +1 @@
+Ensure python uses `malloc` when running Synapse in Docker.
\ No newline at end of file
diff --git a/docker/start.py b/docker/start.py
index 16d6a8208a..55faca600d 100755
--- a/docker/start.py
+++ b/docker/start.py
@@ -218,6 +218,7 @@ def main(args, environ):
 
     if os.path.isfile(jemallocpath):
         environ["LD_PRELOAD"] = jemallocpath
+        environ["PYTHONMALLOC"] = "malloc"
     else:
         log("Could not find %s, will not use" % (jemallocpath,))