diff --git a/CMakeLists.txt b/CMakeLists.txt
index 158309cfb0f00372a479dbff84c5262662767777..616c4d2b2b3add4251d5accc3ff47a205c4ba882 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -78,9 +78,6 @@ option(OGS_USE_LIS "Use Lis" OFF)
 # Parallel computing: vector and matrix algebraic caculation, solvers
 option(OGS_USE_PETSC "Use PETSc routines" OFF)
 
-# Paralleization
-option(OGS_USE_MPI "Use MPI" OFF)
-
 # Eigen
 option(OGS_USE_EIGEN "Use Eigen linear solver" ON)
 option(OGS_USE_EIGEN_UNSUPPORTED "Use Eigen unsupported modules" ON)
diff --git a/Tests/CMakeLists.txt b/Tests/CMakeLists.txt
index 5d93e293cc2620407459660ec186f3d6b3a963db..c6c0d1e94908f160b821abcf0f47eb2755610994 100644
--- a/Tests/CMakeLists.txt
+++ b/Tests/CMakeLists.txt
@@ -28,7 +28,7 @@ if(OGS_BUILD_SWMM)
     APPEND_SOURCE_FILES(TEST_SOURCES FileIO_SWMM)
 endif()
 
-if(OGS_USE_PETSC OR OGS_USE_MPI)
+if(OGS_USE_PETSC)
     list(REMOVE_ITEM TEST_SOURCES NumLib/TestSerialLinearSolver.cpp)
 endif()