diff --git a/cmake/config.cmake b/cmake/config.cmake
index 77b1b4219..b43c5b0df 100644
--- a/cmake/config.cmake
+++ b/cmake/config.cmake
@@ -91,7 +91,7 @@ if(NOT "${SC_ENABLE_MPI}" STREQUAL "${CACHED_SC_ENABLE_MPI}")
   unset(SC_HAVE_MPI_INT8_T CACHE)
   unset(SC_ENABLE_MPIIO CACHE)
   # Update cached variable
-  set(CACHED_SC_ENABLE_MPI "${SC_ENABLE_MPI}" CACHE STRING "Cached value of SC_ENABLE_MPI")
+  set(CACHED_SC_ENABLE_MPI "${SC_ENABLE_MPI}" CACHE STRING "Cached value of SC_ENABLE_MPI" FORCE)
 endif()
 
 if( SC_ENABLE_MPI )
diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
index ba59edbd3..662d276cc 100644
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -1,6 +1,6 @@
 include(CTest)
 
-set(sc_tests allgather arrays keyvalue notify reduce search sortb version scda)
+set(sc_tests allgather arrays keyvalue mpi_pack notify reduce search sortb version scda)
 
 if(SC_HAVE_RANDOM AND SC_HAVE_SRANDOM)
   list(APPEND sc_tests node_comm)
@@ -10,7 +10,7 @@ if(SC_HAVE_UNISTD_H)
   list(APPEND sc_tests sort)
 endif()
 
-list(APPEND sc_tests builtin io_sink helpers)
+list(APPEND sc_tests builtin io_file io_sink helpers)
 
 set(MPI_WRAPPER)
 if(MPIEXEC_EXECUTABLE)