diff --git a/libsrc/include/CMakeLists.txt b/libsrc/include/CMakeLists.txt
index be20944e..233e6357 100644
--- a/libsrc/include/CMakeLists.txt
+++ b/libsrc/include/CMakeLists.txt
@@ -4,7 +4,7 @@ install(FILES
   acisgeom.hpp csg.hpp geometry2d.hpp gprim.hpp incopengl.hpp
   inctcl.hpp incvis.hpp linalg.hpp meshing.hpp myadt.hpp mydefs.hpp
   mystdlib.h nginterface_v2_impl.hpp occgeom.hpp ngsimd.hpp
-  opti.hpp parallel.hpp parallelinterface.hpp stlgeom.hpp visual.hpp
+  opti.hpp parallel.hpp  stlgeom.hpp visual.hpp
   DESTINATION ${NG_INSTALL_DIR_INCLUDE}/include COMPONENT netgen_devel
   )