diff --git a/pkgs/development/libraries/vtk/default.nix b/pkgs/development/libraries/vtk/default.nix
index a7e1bc432904..6a7e26c753cd 100644
--- a/pkgs/development/libraries/vtk/default.nix
+++ b/pkgs/development/libraries/vtk/default.nix
@@ -52,7 +52,7 @@ stdenv.mkDerivation rec {
   # At least, we use -fPIC for other packages to be able to use this in shared
   # objects.
   cmakeFlags = [ "-DCMAKE_C_FLAGS=-fPIC" "-DCMAKE_CXX_FLAGS=-fPIC" "-DVTK_USE_SYSTEM_TIFF=1" "-DOPENGL_INCLUDE_DIR=${libGL}/include" ]
-    ++ optional (qtLib != null) [ "-DVTK_USE_QT:BOOL=ON" ]
+    ++ optional (qtLib != null) [ "-DVTK_Group_Qt:BOOL=ON" ]
     ++ optional stdenv.isDarwin [ "-DOPENGL_INCLUDE_DIR=${OpenGL}/Library/Frameworks" ]
     ++ optional enablePython [ "-DVTK_WRAP_PYTHON:BOOL=ON" ];
 
@@ -66,7 +66,7 @@ stdenv.mkDerivation rec {
 
   meta = {
     description = "Open source libraries for 3D computer graphics, image processing and visualization";
-    homepage = "http://www.vtk.org/";
+    homepage = "https://www.vtk.org/";
     license = stdenv.lib.licenses.bsd3;
     maintainers = with stdenv.lib.maintainers; [ knedlsepp ];
     platforms = with stdenv.lib.platforms; unix;