diff --git a/make.config b/make.config
index fa55f3e..4cefef4 100644
--- a/make.config
+++ b/make.config
@@ -2,7 +2,7 @@ VERSION ?= 2.0.7
 RANLIB  ?= ranlib
 IRPF90  ?= irpf90
 CC      ?= gcc
-FC      ?= gfortran -g -ffree-line-length-none -fPIC # -fopenmp
+FC      ?= gfortran -g -ffree-line-length-none -fPIC
 FCFLAGS ?= -fPIC
 ARCHIVE ?= ar crs
 RANLIB  ?= ranlib
diff --git a/src/libezfio_util.irp.f b/src/libezfio_util.irp.f
index 35e5e50..fa6dc8b 100644
--- a/src/libezfio_util.irp.f
+++ b/src/libezfio_util.irp.f
@@ -220,11 +220,9 @@ subroutine ezfio_read_array_%(type_short)s(dir,fil,rank,dims,dim_max,dat)
     
     allocate (buffer(dim_max))
     read(libezfio_iunit,'(A)') buffer(1:dim_max)
-    !$OMP PARALLEL DO PRIVATE(i)
     do i=1,dim_max
       read(buffer(i),%(fmt)s) dat(i)
     enddo
-    !$OMP END PARALLEL DO
     deallocate(buffer)
     call libezfio_closez(trim(l_filename),'r')
     return
@@ -262,12 +260,10 @@ subroutine ezfio_write_array_%(type_short)s(dir,fil,rank,dims,dim_max,dat)
     write(libezfio_iunit,'(30(I20,X))') dims(1:rank)
     close(unit=libezfio_iunit)
     allocate (buffer(dim_max))
-    !$OMP PARALLEL DO PRIVATE(i)
     do i=1,dim_max
       write(buffer(i)(1:24), %(fmt)s) dat(i)
       buffer(i)(25:25) = ACHAR(10)
     enddo
-    !$OMP END PARALLEL DO
     call libezfio_reopenz_unformatted(trim(l_filename(1)),'wb',err)
     write(libezfio_iunit) buffer
     call libezfio_closez(trim(l_filename(1)),'w')