diff --git a/pkgs/servers/matrix-synapse/default.nix b/pkgs/servers/matrix-synapse/default.nix
index 21cd4a6b86c..b503bb554fe 100644
--- a/pkgs/servers/matrix-synapse/default.nix
+++ b/pkgs/servers/matrix-synapse/default.nix
@@ -24,6 +24,8 @@ buildPythonApplication rec {
     ./homeserver-script.patch
   ];
 
+  buildInputs = [ openssl ];
+
   propagatedBuildInputs = [
     setuptools
     bcrypt