diff --git a/pkgs/desktops/kde-4.4/support/akonadi/default.nix b/pkgs/desktops/kde-4.4/support/akonadi/default.nix
index 1f00d0461b9..b93f65b9a6a 100644
--- a/pkgs/desktops/kde-4.4/support/akonadi/default.nix
+++ b/pkgs/desktops/kde-4.4/support/akonadi/default.nix
@@ -6,6 +6,7 @@ stdenv.mkDerivation rec {
     url = "http://download.akonadi-project.org/${name}.tar.bz2";
     sha256 = "1d2ancspavp4qg717hj56j1likb0ifdr65q1awbc2ghqqgd9znck";
   };
+  patches = [ ./fix-broken-datadir-parameter.patch ];
   buildInputs = [ cmake qt4 shared_mime_info libxslt boost mysql automoc4 soprano ];
   meta = with stdenv.lib; {
     description = "KDE PIM Storage Service";
diff --git a/pkgs/desktops/kde-4.4/support/akonadi/fix-broken-datadir-parameter.patch b/pkgs/desktops/kde-4.4/support/akonadi/fix-broken-datadir-parameter.patch
new file mode 100644
index 00000000000..fa33329d4b0
--- /dev/null
+++ b/pkgs/desktops/kde-4.4/support/akonadi/fix-broken-datadir-parameter.patch
@@ -0,0 +1,17 @@
+Fix broken datadir parameter.
+
+--- akonadi-1.3.85/server/src/storage/dbconfigmysql.cpp	2010-06-09 03:41:30.000000000 -0430
++++ akonadi-local-1.3.85/server/src/storage/dbconfigmysql.cpp	2010-08-11 00:21:20.547181479 -0430
+@@ -250,11 +250,10 @@
+   // synthesize the mysqld command
+   QStringList arguments;
+   arguments << QString::fromLatin1( "--defaults-file=%1/mysql.conf" ).arg( akDir );
++  arguments << QString::fromLatin1( "--datadir=%1/" ).arg( dataDir );
+ #ifndef Q_WS_WIN
+-  arguments << QString::fromLatin1( "--datadir" ) << QString::fromLatin1( "%1/" ).arg( dataDir );
+   arguments << QString::fromLatin1( "--socket=%1/mysql.socket" ).arg( miscDir );
+ #else
+-  arguments << QString::fromLatin1( "--datadir=%1/" ).arg( dataDir );
+   arguments << QString::fromLatin1( "--shared-memory" );
+ #endif
+