diff --git a/src/gw_utils.F b/src/gw_utils.F
index 4ce47c34e7..0a83d4504f 100644
--- a/src/gw_utils.F
+++ b/src/gw_utils.F
@@ -282,6 +282,7 @@ CONTAINS
       CALL section_vals_val_get(gw_sec, "CUTOFF_RADIUS_RI", r_val=bs_env%ri_metric%cutoff_radius)
       CALL section_vals_val_get(gw_sec, "MEMORY_PER_PROC", r_val=bs_env%input_memory_per_proc_GB)
       CALL section_vals_val_get(gw_sec, "APPROX_KP_EXTRAPOL", l_val=bs_env%approx_kp_extrapol)
+      CALL section_vals_val_get(gw_sec, "SIZE_LATTICE_SUM", i_val=bs_env%size_lattice_sum_V)
       CALL section_vals_val_get(gw_sec, "HEDIN_SHIFT", l_val=bs_env%do_hedin_shift)
 
       CALL timestop(handle)
@@ -1471,11 +1472,6 @@ CONTAINS
 
       CALL timeset(routineN, handle)
 
-      ! Determines number of cells used for summing the cells R in the Coulomb matrix,
-      ! V_PQ(k) = \sum_R <P,cell=0 | 1/r | Q,cell=R>. SIZE_LATTICE_SUM_V 3 gives
-      ! good convergence
-      bs_env%size_lattice_sum_V = 3
-
       ! for generating numerically stable minimax Fourier integration weights
       bs_env%num_points_per_magnitude = 200
 
diff --git a/src/input_cp2k_properties_dft.F b/src/input_cp2k_properties_dft.F
index 6c234e75cd..4df0bb89b9 100644
--- a/src/input_cp2k_properties_dft.F
+++ b/src/input_cp2k_properties_dft.F
@@ -2137,6 +2137,18 @@ CONTAINS
       CALL section_add_keyword(section, keyword)
       CALL keyword_release(keyword)
 
+      CALL keyword_create(keyword, __LOCATION__, name="SIZE_LATTICE_SUM", &
+                          description="Parameter determines how many neighbor cells $\mathbf{R}$ "// &
+                          "are used for computing "// &
+                          "$V_{PQ}(\mathbf{k}) = "//&
+                          "\sum_{\mathbf{R}} e^{i\mathbf{k}\cdot\mathbf{R}}\,\langle P, "// &
+                          "\text{cell}{=}\mathbf{0}|1/r|Q,\text{cell}{=}\mathbf{R}\rangle$."// &
+                          "Normally, parameter does not need to be touched.", &
+                          usage="SIZE_LATTICE_SUM 4", &
+                          default_i_val=3)
+      CALL section_add_keyword(section, keyword)
+      CALL keyword_release(keyword)
+
       CALL keyword_create(keyword, __LOCATION__, name="HEDIN_SHIFT", &
                           description="If true, use Hedin's shift in G0W0, evGW and evGW0. "// &
                           "Details see in Li et al. JCTC 18, 7570 "// &