diff --git a/pkgs/applications/kde/kontactinterface.nix b/pkgs/applications/kde/kontactinterface.nix
index b7e033deb0a0..858addcd3ffa 100644
--- a/pkgs/applications/kde/kontactinterface.nix
+++ b/pkgs/applications/kde/kontactinterface.nix
@@ -12,6 +12,7 @@ mkDerivation {
   };
   nativeBuildInputs = [ extra-cmake-modules kdoctools ];
   buildInputs = [
-    kiconthemes kparts kwindowsystem kxmlgui
+    kiconthemes kwindowsystem kxmlgui
   ];
+  propagatedBuildInputs = [ kparts ];
 }