diff --git a/CMakeLists.txt b/CMakeLists.txt
index 600ffe306fa8c2527e185315080c37c448322b0a..9cb575640b9859a1a5b57b6abaf05a7e360bb3d6 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -873,9 +873,9 @@ if(HAVE_SOLVER)
            PETSC_VARIABLES NEWLINE_CONSUME)
       # find include directories
       list(APPEND EXTERNAL_INCLUDES ${ENV_PETSC_DIR}/include)
-      if(NOT HAVE_MPI) # necessary for PETSC >= 3.4
-        list(APPEND EXTERNAL_INCLUDES ${ENV_PETSC_DIR}/include/mpiuni)
-      endif(NOT HAVE_MPI)
+      #if(NOT HAVE_MPI) # necessary for PETSC >= 3.4
+      #  list(APPEND EXTERNAL_INCLUDES ${ENV_PETSC_DIR}/include/mpiuni)
+      #endif(NOT HAVE_MPI)
       list(APPEND EXTERNAL_INCLUDES ${ENV_PETSC_DIR}/${ENV_PETSC_ARCH}/include)
       string(REGEX MATCH "PACKAGES_INCLUDES = [^\n\r]*" PETSC_PACKAGES_INCLUDES
              ${PETSC_VARIABLES})