diff --git a/spine-unity/Assets/Spine/Editor/spine-unity/Editor/Components/BoundingBoxFollowerInspector.cs b/spine-unity/Assets/Spine/Editor/spine-unity/Editor/Components/BoundingBoxFollowerInspector.cs
index d5692e2f1..eebc2909a 100644
--- a/spine-unity/Assets/Spine/Editor/spine-unity/Editor/Components/BoundingBoxFollowerInspector.cs
+++ b/spine-unity/Assets/Spine/Editor/spine-unity/Editor/Components/BoundingBoxFollowerInspector.cs
@@ -27,7 +27,7 @@
  * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *****************************************************************************/
 
-#if UNITY_2018_3 || UNITY_2019
+#if UNITY_2018_3 || UNITY_2019 || UNITY_2018_3_OR_NEWER
 #define NEW_PREFAB_SYSTEM
 #endif
 
diff --git a/spine-unity/Assets/Spine/Editor/spine-unity/Editor/Components/SkeletonRendererInspector.cs b/spine-unity/Assets/Spine/Editor/spine-unity/Editor/Components/SkeletonRendererInspector.cs
index 94a1acbd0..b5c8891c8 100644
--- a/spine-unity/Assets/Spine/Editor/spine-unity/Editor/Components/SkeletonRendererInspector.cs
+++ b/spine-unity/Assets/Spine/Editor/spine-unity/Editor/Components/SkeletonRendererInspector.cs
@@ -27,7 +27,7 @@
  * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *****************************************************************************/
 
-#if UNITY_2018_3 || UNITY_2019
+#if UNITY_2018_3 || UNITY_2019 || UNITY_2018_3_OR_NEWER
 #define NEW_PREFAB_SYSTEM
 #else
 #define NO_PREFAB_MESH
diff --git a/spine-unity/Assets/Spine/Editor/spine-unity/Editor/Components/SkeletonUtilityInspector.cs b/spine-unity/Assets/Spine/Editor/spine-unity/Editor/Components/SkeletonUtilityInspector.cs
index cb20cedef..ace520684 100644
--- a/spine-unity/Assets/Spine/Editor/spine-unity/Editor/Components/SkeletonUtilityInspector.cs
+++ b/spine-unity/Assets/Spine/Editor/spine-unity/Editor/Components/SkeletonUtilityInspector.cs
@@ -27,7 +27,7 @@
  * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *****************************************************************************/
 
-#if UNITY_2018_3 || UNITY_2019
+#if UNITY_2018_3 || UNITY_2019 || UNITY_2018_3_OR_NEWER
 #define NEW_PREFAB_SYSTEM
 #endif
 
diff --git a/spine-unity/Assets/Spine/Editor/spine-unity/Editor/Windows/SkeletonBaker.cs b/spine-unity/Assets/Spine/Editor/spine-unity/Editor/Windows/SkeletonBaker.cs
index 3fe48ad82..7d65654e7 100644
--- a/spine-unity/Assets/Spine/Editor/spine-unity/Editor/Windows/SkeletonBaker.cs
+++ b/spine-unity/Assets/Spine/Editor/spine-unity/Editor/Windows/SkeletonBaker.cs
@@ -27,7 +27,7 @@
  * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *****************************************************************************/
 
-#if UNITY_2018_3 || UNITY_2019
+#if UNITY_2018_3 || UNITY_2019 || UNITY_2018_3_OR_NEWER
 #define NEW_PREFAB_SYSTEM
 #endif
 
diff --git a/spine-unity/Assets/Spine/Editor/spine-unity/Editor/Windows/SkeletonBakingWindow.cs b/spine-unity/Assets/Spine/Editor/spine-unity/Editor/Windows/SkeletonBakingWindow.cs
index 87d9b2903..ac35c57b4 100644
--- a/spine-unity/Assets/Spine/Editor/spine-unity/Editor/Windows/SkeletonBakingWindow.cs
+++ b/spine-unity/Assets/Spine/Editor/spine-unity/Editor/Windows/SkeletonBakingWindow.cs
@@ -27,7 +27,7 @@
  * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *****************************************************************************/
 
-#if UNITY_2018_3 || UNITY_2019
+#if UNITY_2018_3 || UNITY_2019 || UNITY_2018_3_OR_NEWER
 #define NEW_PREFAB_SYSTEM
 #endif
 
diff --git a/spine-unity/Assets/Spine/Editor/spine-unity/Editor/Windows/SkeletonDebugWindow.cs b/spine-unity/Assets/Spine/Editor/spine-unity/Editor/Windows/SkeletonDebugWindow.cs
index ff8a44916..b4577e2cf 100644
--- a/spine-unity/Assets/Spine/Editor/spine-unity/Editor/Windows/SkeletonDebugWindow.cs
+++ b/spine-unity/Assets/Spine/Editor/spine-unity/Editor/Windows/SkeletonDebugWindow.cs
@@ -29,7 +29,7 @@
 
 // With contributions from: Mitch Thompson
 
-#if UNITY_2018_3 || UNITY_2019
+#if UNITY_2018_3 || UNITY_2019 || UNITY_2018_3_OR_NEWER
 #define NEW_PREFAB_SYSTEM
 #else
 #define NO_PREFAB_MESH
diff --git a/spine-unity/Assets/Spine/Runtime/spine-unity/Components/Following/BoneFollower.cs b/spine-unity/Assets/Spine/Runtime/spine-unity/Components/Following/BoneFollower.cs
index 2723662d7..a18ed6f30 100644
--- a/spine-unity/Assets/Spine/Runtime/spine-unity/Components/Following/BoneFollower.cs
+++ b/spine-unity/Assets/Spine/Runtime/spine-unity/Components/Following/BoneFollower.cs
@@ -27,7 +27,7 @@
  * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *****************************************************************************/
 
-#if UNITY_2018_3 || UNITY_2019
+#if UNITY_2018_3 || UNITY_2019 || UNITY_2018_3_OR_NEWER
 #define NEW_PREFAB_SYSTEM
 #endif