diff --git a/pkgs/servers/matrix-synapse/plugins/s3-storage-provider.nix b/pkgs/servers/matrix-synapse/plugins/s3-storage-provider.nix
index 42d62539b6b3..92e111dbb623 100644
--- a/pkgs/servers/matrix-synapse/plugins/s3-storage-provider.nix
+++ b/pkgs/servers/matrix-synapse/plugins/s3-storage-provider.nix
@@ -7,6 +7,7 @@
 , pythonOlder
 , tqdm
 , twisted
+, psycopg2
 }:
 
 buildPythonPackage rec {
@@ -37,6 +38,7 @@ buildPythonPackage rec {
     humanize
     tqdm
     twisted
+    psycopg2
   ]
   # For the s3_media_upload script
   ++ matrix-synapse-unwrapped.propagatedBuildInputs;