diff --git a/pymolfile/molfile/external/CMakeLists.txt b/pymolfile/molfile/external/CMakeLists.txt
index 85386fada6e254d3e9e3fd39e07f9e10861e7263..8e262e19745fb3d03c048da7b404d036e8f1824d 100644
--- a/pymolfile/molfile/external/CMakeLists.txt
+++ b/pymolfile/molfile/external/CMakeLists.txt
@@ -25,3 +25,10 @@ add_custom_target(tngio_comp ALL
                   DEPENDS ${CMAKE_CURRENT_BINARY_DIR}/tng
 )
 
+ADD_CUSTOM_COMMAND(TARGET tng
+                POST_BUILD
+                COMMAND ${CMAKE_COMMAND} -E copy_directory ${TNG_INSTALL_DIR}/lib64 ${TNG_INSTALL_DIR}/lib 
+                DEPENDS ${TNG_INSTALL_DIR}/lib64
+                COMMENT "Copying tng/lib64 to tng/lib"
+                )
+