diff --git a/base/modules/Makefile b/base/modules/Makefile
index d14a24ee..0d90b9f1 100644
--- a/base/modules/Makefile
+++ b/base/modules/Makefile
@@ -271,7 +271,7 @@ serial/psb_z_vect_mod.o: serial/psb_z_base_vect_mod.o serial/psb_i_vect_mod.o
 serial/psb_s_serial_mod.o serial/psb_d_serial_mod.o serial/psb_c_serial_mod.o serial/psb_z_serial_mod.o: serial/psb_mat_mod.o auxil/psb_string_mod.o auxil/psb_sort_mod.o auxil/psi_serial_mod.o
 serial/psb_vect_mod.o: serial/psb_i_vect_mod.o serial/psb_l_vect_mod.o serial/psb_d_vect_mod.o serial/psb_s_vect_mod.o serial/psb_c_vect_mod.o serial/psb_z_vect_mod.o
 
-serial/psb_d_rb_idx_tree_mod.o: serial/psb_d_csr_mat_mod.o
+serial/psb_d_rb_idx_tree_mod.o: serial/psb_d_csr_mat_mod.o psb_realloc_mod.o
 serial/psb_rb_idx_tree_mod.o: serial/psb_d_rb_idx_tree_mod.o
 
 error.o psb_realloc_mod.o: psb_error_mod.o 
diff --git a/base/serial/impl/psb_d_rb_idx_tree_impl.F90 b/base/serial/impl/psb_d_rb_idx_tree_impl.F90
index 8495a813..a6bdc86f 100644
--- a/base/serial/impl/psb_d_rb_idx_tree_impl.F90
+++ b/base/serial/impl/psb_d_rb_idx_tree_impl.F90
@@ -226,6 +226,7 @@ subroutine psb_d_rb_idx_tree_merge(trees, mat)
 #if defined(OPENMP)
     use omp_lib
 #endif
+    use psb_realloc_mod
     use psb_d_rb_idx_tree_mod, psb_protect_name => psb_d_rb_idx_tree_merge
     use psb_d_csr_mat_mod, only : psb_d_csr_sparse_mat
     implicit none