diff --git a/base/serial/impl/psb_c_coo_impl.F90 b/base/serial/impl/psb_c_coo_impl.F90
index 46391dee..b1d71321 100644
--- a/base/serial/impl/psb_c_coo_impl.F90
+++ b/base/serial/impl/psb_c_coo_impl.F90
@@ -2878,14 +2878,20 @@ subroutine psb_c_coo_csput_a(nz,ia,ja,val,a,imin,imax,jmin,jmax,info)
     if (isza < (nza+nz)) then
       info = psb_err_alloc_dealloc_; call psb_errpush(info,name)
     else
+#if defined(OPENMP)      
       nzaold = nza
       nza = nza + nz
+#endif
       call a%set_nzeros(nza)
     end if
     !$omp end critical
     if (info /= 0)  goto 9999
     call psb_inner_ins(nz,ia,ja,val,nzaold,a%ia,a%ja,a%val,isza,&
          & imin,imax,jmin,jmax,info)
+#if !defined(OPENMP)      
+    nza = nzaold
+    call a%set_nzeros(nza)
+#endif
     call a%set_sorted(.false.)
     
   else  if (a%is_upd()) then
diff --git a/base/serial/impl/psb_d_coo_impl.F90 b/base/serial/impl/psb_d_coo_impl.F90
index c2babf8e..350085bb 100644
--- a/base/serial/impl/psb_d_coo_impl.F90
+++ b/base/serial/impl/psb_d_coo_impl.F90
@@ -2878,14 +2878,20 @@ subroutine psb_d_coo_csput_a(nz,ia,ja,val,a,imin,imax,jmin,jmax,info)
     if (isza < (nza+nz)) then
       info = psb_err_alloc_dealloc_; call psb_errpush(info,name)
     else
+#if defined(OPENMP)      
       nzaold = nza
       nza = nza + nz
+#endif
       call a%set_nzeros(nza)
     end if
     !$omp end critical
     if (info /= 0)  goto 9999
     call psb_inner_ins(nz,ia,ja,val,nzaold,a%ia,a%ja,a%val,isza,&
          & imin,imax,jmin,jmax,info)
+#if !defined(OPENMP)      
+    nza = nzaold
+    call a%set_nzeros(nza)
+#endif
     call a%set_sorted(.false.)
     
   else  if (a%is_upd()) then
diff --git a/base/serial/impl/psb_s_coo_impl.F90 b/base/serial/impl/psb_s_coo_impl.F90
index 402c608a..51858efd 100644
--- a/base/serial/impl/psb_s_coo_impl.F90
+++ b/base/serial/impl/psb_s_coo_impl.F90
@@ -2878,14 +2878,20 @@ subroutine psb_s_coo_csput_a(nz,ia,ja,val,a,imin,imax,jmin,jmax,info)
     if (isza < (nza+nz)) then
       info = psb_err_alloc_dealloc_; call psb_errpush(info,name)
     else
+#if defined(OPENMP)      
       nzaold = nza
       nza = nza + nz
+#endif
       call a%set_nzeros(nza)
     end if
     !$omp end critical
     if (info /= 0)  goto 9999
     call psb_inner_ins(nz,ia,ja,val,nzaold,a%ia,a%ja,a%val,isza,&
          & imin,imax,jmin,jmax,info)
+#if !defined(OPENMP)      
+    nza = nzaold
+    call a%set_nzeros(nza)
+#endif
     call a%set_sorted(.false.)
     
   else  if (a%is_upd()) then
diff --git a/base/serial/impl/psb_z_coo_impl.F90 b/base/serial/impl/psb_z_coo_impl.F90
index 542f842e..0624dd21 100644
--- a/base/serial/impl/psb_z_coo_impl.F90
+++ b/base/serial/impl/psb_z_coo_impl.F90
@@ -2878,14 +2878,20 @@ subroutine psb_z_coo_csput_a(nz,ia,ja,val,a,imin,imax,jmin,jmax,info)
     if (isza < (nza+nz)) then
       info = psb_err_alloc_dealloc_; call psb_errpush(info,name)
     else
+#if defined(OPENMP)      
       nzaold = nza
       nza = nza + nz
+#endif
       call a%set_nzeros(nza)
     end if
     !$omp end critical
     if (info /= 0)  goto 9999
     call psb_inner_ins(nz,ia,ja,val,nzaold,a%ia,a%ja,a%val,isza,&
          & imin,imax,jmin,jmax,info)
+#if !defined(OPENMP)      
+    nza = nzaold
+    call a%set_nzeros(nza)
+#endif
     call a%set_sorted(.false.)
     
   else  if (a%is_upd()) then