diff --git a/pkgs/development/python-modules/vdirsyncer/default.nix b/pkgs/development/python-modules/vdirsyncer/default.nix
index b93b03108767..fa3e4b67be06 100644
--- a/pkgs/development/python-modules/vdirsyncer/default.nix
+++ b/pkgs/development/python-modules/vdirsyncer/default.nix
@@ -2,6 +2,7 @@
   lib,
   buildPythonPackage,
   fetchPypi,
+  fetchpatch,
   pythonOlder,
   click,
   click-log,
@@ -38,6 +39,18 @@ buildPythonPackage rec {
     hash = "sha256-5DeFH+uYXew1RGVPj5z23RCbCwP34ZlWCGYDCS/+so8=";
   };
 
+  patches = [
+    (
+      # Fix event_loop missing
+      # TODO: remove it after vdirsyncer release 0.19.4
+      fetchpatch {
+        # https://github.com/pimutils/vdirsyncer/pull/1185
+        url = "https://github.com/pimutils/vdirsyncer/commit/164559ad7a95ed795ce4ae8d9b287bd27704742d.patch";
+        hash = "sha256-nUGvkBnHr8nVPpBuhQ5GjaRs3QSxokdZUEIsOrQ+lpo=";
+      }
+    )
+  ];
+
   nativeBuildInputs = [
     setuptools
     setuptools-scm