diff --git a/Editor/LODGeneratorHelperEditor.cs b/Editor/LODGeneratorHelperEditor.cs
index 555f681..1068f1a 100644
--- a/Editor/LODGeneratorHelperEditor.cs
+++ b/Editor/LODGeneratorHelperEditor.cs
@@ -610,12 +610,12 @@ where go.transform.IsChildOf(ourTransform)
 
             var notChildGameObjects = from go in gameObjects
                                       where !go.transform.IsChildOf(ourTransform)
-#if UNITY_2018_3 || UNITY_2018_4 || UNITY_2019
+#if UNITY_2018_3 || UNITY_2018_4 || UNITY_2019 || UNITY_2020
                                          && !PrefabUtility.IsPartOfAnyPrefab(go)
 #endif
                                       select go;
 
-#if UNITY_2018_3 || UNITY_2018_4 || UNITY_2019
+#if UNITY_2018_3 || UNITY_2018_4 || UNITY_2019 || UNITY_2020
             var prefabGameObjects = from go in gameObjects
                                     where !go.transform.IsChildOf(ourTransform) &&
                                         PrefabUtility.IsPartOfAnyPrefab(go)
diff --git a/Runtime/MeshCombiner.cs b/Runtime/MeshCombiner.cs
index badc10f..b5653ce 100644
--- a/Runtime/MeshCombiner.cs
+++ b/Runtime/MeshCombiner.cs
@@ -24,7 +24,7 @@ OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 */
 #endregion
 
-#if UNITY_2017_3 || UNITY_2017_4 || UNITY_2018 || UNITY_2019
+#if UNITY_2017_3 || UNITY_2017_4 || UNITY_2018 || UNITY_2019 || UNITY_2020
 #define UNITY_MESH_INDEXFORMAT_SUPPORT
 #endif
 
diff --git a/Runtime/MeshSimplifier.cs b/Runtime/MeshSimplifier.cs
index a921d54..da043e2 100644
--- a/Runtime/MeshSimplifier.cs
+++ b/Runtime/MeshSimplifier.cs
@@ -37,11 +37,11 @@ OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 //https://github.com/sp4cerat/Fast-Quadric-Mesh-Simplification
 #endregion
 
-#if UNITY_2018_2 || UNITY_2018_3 || UNITY_2018_4 || UNITY_2019
+#if UNITY_2018_2 || UNITY_2018_3 || UNITY_2018_4 || UNITY_2019 || UNITY_2020
 #define UNITY_8UV_SUPPORT
 #endif
 
-#if UNITY_2017_3 || UNITY_2017_4 || UNITY_2018 || UNITY_2019
+#if UNITY_2017_3 || UNITY_2017_4 || UNITY_2018 || UNITY_2019 || UNITY_2020
 #define UNITY_MESH_INDEXFORMAT_SUPPORT
 #endif
 
diff --git a/Runtime/Utility/MeshUtils.cs b/Runtime/Utility/MeshUtils.cs
index 3b9c803..2df867b 100644
--- a/Runtime/Utility/MeshUtils.cs
+++ b/Runtime/Utility/MeshUtils.cs
@@ -24,11 +24,11 @@ OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 */
 #endregion
 
-#if UNITY_2018_2 || UNITY_2018_3 || UNITY_2018_4 || UNITY_2019
+#if UNITY_2018_2 || UNITY_2018_3 || UNITY_2018_4 || UNITY_2019 || UNITY_2020
 #define UNITY_8UV_SUPPORT
 #endif
 
-#if UNITY_2017_3 || UNITY_2017_4 || UNITY_2018 || UNITY_2019
+#if UNITY_2017_3 || UNITY_2017_4 || UNITY_2018 || UNITY_2019 || UNITY_2020
 #define UNITY_MESH_INDEXFORMAT_SUPPORT
 #endif
 
diff --git a/Tests/Editor/MeshUtilsTest.cs b/Tests/Editor/MeshUtilsTest.cs
index 4e44eb2..140ea7b 100644
--- a/Tests/Editor/MeshUtilsTest.cs
+++ b/Tests/Editor/MeshUtilsTest.cs
@@ -24,7 +24,7 @@ OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 */
 #endregion
 
-#if UNITY_2017_3 || UNITY_2017_4 || UNITY_2018 || UNITY_2019
+#if UNITY_2017_3 || UNITY_2017_4 || UNITY_2018 || UNITY_2019 || UNITY_2020
 #define UNITY_MESH_INDEXFORMAT_SUPPORT
 #endif