diff --git a/pyart/map/_gate_to_grid_map.pyx b/pyart/map/_gate_to_grid_map.pyx
index 512af344a2..6dd22f4521 100644
--- a/pyart/map/_gate_to_grid_map.pyx
+++ b/pyart/map/_gate_to_grid_map.pyx
@@ -232,7 +232,7 @@ cdef class GateToGridMapper:
             float[:, ::1] gate_z, float[:, ::1] gate_y, float[:, ::1] gate_x,
             float[:, :, ::1] field_data,
             char[:, :, ::1] field_mask, char[:, ::1] excluded_gates,
-            float toa, RoIFunction roi_func, int weighting_function,
+            RoIFunction roi_func, int weighting_function,
             float zdist_factor):
         """
         Map radar gates unto the regular grid.
diff --git a/pyart/map/gates_to_grid.py b/pyart/map/gates_to_grid.py
index 49771e71fa..882f4c6785 100644
--- a/pyart/map/gates_to_grid.py
+++ b/pyart/map/gates_to_grid.py
@@ -30,7 +30,6 @@ def map_gates_to_grid(
     gatefilters=False,
     map_roi=True,
     weighting_function="Barnes2",
-    toa=17000.0,
     roi_func="dist_beam",
     constant_roi=None,
     z_factor=0.05,
@@ -173,7 +172,6 @@ def map_gates_to_grid(
             field_data,
             field_mask,
             excluded_gates,
-            toa,
             roi_func,
             cy_weighting_function,
             zdist_factor,