diff --git a/dfm_tools/meshkernel_helpers.py b/dfm_tools/meshkernel_helpers.py
index e7098b009..f41238464 100644
--- a/dfm_tools/meshkernel_helpers.py
+++ b/dfm_tools/meshkernel_helpers.py
@@ -423,6 +423,6 @@ def interpolate_bndpli(bnd_gdf,res):
         if len(bnd_ls_interp_points)==1: #no change if interp results in only one point
             continue
         bnd_ls_interp = LineString(bnd_ls_interp_points)
-        bnd_gdf_interp['geometry'][irow] = bnd_ls_interp
+        bnd_gdf_interp.loc[irow,'geometry'] = bnd_ls_interp
     return bnd_gdf_interp
 
diff --git a/tests/test_meshkernel_helpers.py b/tests/test_meshkernel_helpers.py
index 719a4b0eb..42c0092bb 100644
--- a/tests/test_meshkernel_helpers.py
+++ b/tests/test_meshkernel_helpers.py
@@ -316,11 +316,11 @@ def test_generate_bndpli_cutland():
                   [-68.31, -68.27, 12.10, 12.21,   2,  5]]
     
     dxy = 0.02
-    
+    crs = 4326
     for params in params_all:
         lon_min, lon_max, lat_min, lat_max, len_gdf, len_linestr0 = params
     
-        mk_object = dfmt.make_basegrid(lon_min, lon_max, lat_min, lat_max, dx=dxy, dy=dxy, crs=4326)
+        mk_object = dfmt.make_basegrid(lon_min, lon_max, lat_min, lat_max, dx=dxy, dy=dxy, crs=crs)
         bnd_gdf = dfmt.generate_bndpli_cutland(mk=mk_object, res='h', buffer=0.01)
         
         # fig, ax = plt.subplots()
@@ -330,3 +330,19 @@ def test_generate_bndpli_cutland():
         
         assert len(bnd_gdf) == len_gdf
         assert len(bnd_gdf.geometry[0].xy[0]) == len_linestr0
+
+
+@pytest.mark.unittest
+def test_interpolate_bndpli():
+    dxy = 0.02
+    crs = 4326
+    lon_min, lon_max, lat_min, lat_max = -68.55, -68.05, 11.95, 12.4
+
+    mk_object = dfmt.make_basegrid(lon_min, lon_max, lat_min, lat_max, dx=dxy, dy=dxy, crs=crs)
+    bnd_gdf = dfmt.generate_bndpli_cutland(mk=mk_object, res='h', buffer=0.01)
+    bnd_gdf_ref = dfmt.interpolate_bndpli(bnd_gdf, res=0.00511)
+
+    assert len(bnd_gdf) == 1
+    assert len(bnd_gdf.geometry[0].xy[0]) == 99
+    assert len(bnd_gdf_ref) == 1
+    assert len(bnd_gdf_ref.geometry[0].xy[0]) == 377