diff --git a/pkgs/tools/misc/vdirsyncer/default.nix b/pkgs/tools/misc/vdirsyncer/default.nix
index ecf87b7c0a5..eee4e5648e9 100644
--- a/pkgs/tools/misc/vdirsyncer/default.nix
+++ b/pkgs/tools/misc/vdirsyncer/default.nix
@@ -53,6 +53,9 @@ python3Packages.buildPythonApplication rec {
     echo 'Version: ${version}' >PKG-INFO
 
     sed -i 's/spec.add_external_build(cmd=cmd/spec.add_external_build(cmd="true"/g' setup.py
+
+    # fixing test
+    sed -i "s/invalid value for \"--verbosity\"/invalid value for \\\'--verbosity\\\'/" tests/system/cli/test_sync.py
   '';
 
   preBuild = ''