diff --git a/CHANGELOG.md b/CHANGELOG.md
index 26f2b0a3c7a9..cd70c5ca8e1c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -25,7 +25,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 * Changed directory where ghuser components are installed.
 * Added ghuser components directory to those removed by the `clean` task.
 * Clean up the ghuser directory before building ghuser components.
-* Fixed bug in `compas.geometry.distance.closest_point_on_segment_xy`
+* Fixed bug in `compas.geometry.distance.closest_point_on_segment_xy`.
+* Fixed bug in Rhino implementations of `trimesh` curvature functions.
 
 ### Removed
 
diff --git a/src/compas_rhino/geometry/trimesh/curvature.py b/src/compas_rhino/geometry/trimesh/curvature.py
index 78eed3b5b732..007e8b65d1b4 100644
--- a/src/compas_rhino/geometry/trimesh/curvature.py
+++ b/src/compas_rhino/geometry/trimesh/curvature.py
@@ -76,11 +76,10 @@ def trimesh_gaussian_curvature(M):
     # (0) see if input is already Rhino.Geometry.Mesh
     mesh = Rhino.Geometry.Mesh()
     if not isinstance(M, Rhino.Geometry.Mesh):
-        for vertices, faces in M:
-            for x, y, z in vertices:
-                mesh.Vertices.Add(x, y, z)
-            for face in faces:
-                mesh.Faces.AddFace(*face)
+        for x, y, z in M[0]:
+            mesh.Vertices.Add(x, y, z)
+        for face in M[1]:
+            mesh.Faces.AddFace(*face)
     else:
         mesh = M
 
@@ -170,11 +169,10 @@ def trimesh_mean_curvature(M):
     # (0) see if input is already Rhino.Geometry.Mesh
     mesh = Rhino.Geometry.Mesh()
     if not isinstance(M, Rhino.Geometry.Mesh):
-        for vertices, faces in M:
-            for x, y, z in vertices:
-                mesh.Vertices.Add(x, y, z)
-            for face in faces:
-                mesh.Faces.AddFace(*face)
+        for x, y, z in M[0]:
+            mesh.Vertices.Add(x, y, z)
+        for face in M[1]:
+            mesh.Faces.AddFace(*face)
     else:
         mesh = M
 
@@ -275,11 +273,10 @@ def trimesh_principal_curvature(M):
     # (0) see if input is already Rhino.Geometry.Mesh
     mesh = Rhino.Geometry.Mesh()
     if not isinstance(M, Rhino.Geometry.Mesh):
-        for vertices, faces in M:
-            for x, y, z in vertices:
-                mesh.Vertices.Add(x, y, z)
-            for face in faces:
-                mesh.Faces.AddFace(*face)
+        for x, y, z in M[0]:
+            mesh.Vertices.Add(x, y, z)
+        for face in M[1]:
+            mesh.Faces.AddFace(*face)
     else:
         mesh = M