diff --git a/dune/contact/solvers/CMakeLists.txt b/dune/contact/solvers/CMakeLists.txt
index 309d72f84309959e5fa6435b3a3317755a7a7a87..fab2260d67ed4ca1a0951a3c3ff9609ffdd498b5 100644
--- a/dune/contact/solvers/CMakeLists.txt
+++ b/dune/contact/solvers/CMakeLists.txt
@@ -5,14 +5,14 @@ install(FILES
     contacttransfer.hh
     dgtransfer.cc
     dgtransfer.hh
-    nsnewtoncontacttransfer.cc
-    nsnewtoncontacttransfer.hh
-    nsnewtonmgstep.cc
-    nsnewtonmgstep.hh
     filtercontactsolver.hh
     filtercontactsolver.cc
     filtermultigridsolver.cc
     filtermultigridsolver.hh
+    nsnewtoncontacttransfer.cc
+    nsnewtoncontacttransfer.hh
+    nsnewtonmgstep.cc
+    nsnewtonmgstep.hh
     primaldualsemismoothnewtonsolver.hh
     primaldualsemismoothnewtonsolver.cc
     tnnmmgcontactstep.hh