diff --git a/configure b/configure
index 0832aa87..0c59d9fd 100755
--- a/configure
+++ b/configure
@@ -7550,7 +7550,6 @@ fi
 if test x"$pac_cv_serial_mpi" == x"yes" ; then
    FDEFINES="$psblas_cv_define_prepend-DSERIAL_MPI $psblas_cv_define_prepend-DMPI_MOD $FDEFINES";
    CDEFINES="-DSERIAL_MPI $CDEFINES"
-   CXXDEFINES="-DSERIAL_MPI $CXXDEFINES"
 else
  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking MPI Fortran 2008 interface" >&5
 printf %s "checking MPI Fortran 2008 interface... " >&6; }