diff --git a/com.htc.upm.vive.openxr/Runtime/CompositionLayer/Scripts/CompositionLayerPassthroughAPI.cs b/com.htc.upm.vive.openxr/Runtime/CompositionLayer/Scripts/CompositionLayerPassthroughAPI.cs
index 91ba06a..3280074 100644
--- a/com.htc.upm.vive.openxr/Runtime/CompositionLayer/Scripts/CompositionLayerPassthroughAPI.cs
+++ b/com.htc.upm.vive.openxr/Runtime/CompositionLayer/Scripts/CompositionLayerPassthroughAPI.cs
@@ -415,6 +415,9 @@ public static bool DestroyPassthrough(int passthroughID)
 #endif
 #if UNITY_ANDROID
 			return passthroughFeature.HTCPassthrough_DestroyPassthrough(passthroughID);
+#endif
+#if !UNITY_ANDROID && !UNITY_STANDALONE
+			return false;
 #endif
 		}
 
@@ -473,6 +476,9 @@ public static bool SetPassthroughAlpha(int passthroughID, float alpha, bool auto
 			}
 			else
 				return false;
+#endif
+#if !UNITY_ANDROID && !UNITY_STANDALONE
+			return false;
 #endif
 		}
 
@@ -544,6 +550,9 @@ public static bool SetProjectedPassthroughMesh(int passthroughID, [In, Out] Vect
 			//Note: Ignore Clock-Wise definition of index buffer for now as passthrough extension does not have back-face culling
 #if UNITY_ANDROID
 			return passthroughFeature.HTCPassthrough_SetMesh(passthroughID, (uint)vertexBuffer.Length, vertexBufferXrVector, (uint)indexBuffer.Length, indexBufferUint); ;
+#endif
+#if !UNITY_ANDROID && !UNITY_STANDALONE
+			return false;
 #endif
 		}
 
@@ -622,6 +631,9 @@ public static bool SetProjectedPassthroughMeshTransform(int passthroughID, Proje
 #endif
 #if UNITY_ANDROID
 			return passthroughFeature.HTCPassthrough_SetMeshTransform(passthroughID, passthroughFeature.GetXrSpaceFromSpaceType(spaceType), meshXrPose, meshXrScale);
+#endif
+#if !UNITY_ANDROID && !UNITY_STANDALONE
+			return false;
 #endif
 		}
 
@@ -662,6 +674,9 @@ public static bool SetPassthroughLayerType(int passthroughID, LayerType layerTyp
 			return passthroughFeature.HTCPassthrough_SetLayerType(passthroughID, layerType, compositionDepth);
 #endif
 
+#if !UNITY_ANDROID && !UNITY_STANDALONE
+			return false;
+#endif
 		}
 
 		/// <summary>
@@ -701,6 +716,9 @@ public static bool SetProjectedPassthroughSpaceType(int passthroughID, Projected
 #endif
 #if UNITY_ANDROID
 			return passthroughFeature.HTCPassthrough_SetMeshTransformSpace(passthroughID, passthroughFeature.GetXrSpaceFromSpaceType(spaceType));
+#endif
+#if !UNITY_ANDROID && !UNITY_STANDALONE
+			return false;
 #endif
 		}
 
@@ -763,6 +781,9 @@ public static bool SetProjectedPassthroughMeshPosition(int passthroughID, Vector
 #endif
 #if UNITY_ANDROID
 			return passthroughFeature.HTCPassthrough_SetMeshTransformPosition(passthroughID, OpenXRHelper.ToOpenXRVector(trackingSpaceMeshPosition, convertFromUnityToOpenXR));
+#endif
+#if !UNITY_ANDROID && !UNITY_STANDALONE
+			return false;
 #endif
 		}
 
@@ -825,6 +846,9 @@ public static bool SetProjectedPassthroughMeshOrientation(int passthroughID, Qua
 #endif
 #if UNITY_ANDROID
 			return passthroughFeature.HTCPassthrough_SetMeshTransformOrientation(passthroughID, OpenXRHelper.ToOpenXRQuaternion(trackingSpaceMeshRotation, convertFromUnityToOpenXR));
+#endif
+#if !UNITY_ANDROID && !UNITY_STANDALONE
+			return false;
 #endif
 		}
 
@@ -866,6 +890,9 @@ public static bool SetProjectedPassthroughScale(int passthroughID, Vector3 meshS
 
 #if UNITY_ANDROID
 			return passthroughFeature.HTCPassthrough_SetMeshTransformScale(passthroughID, OpenXRHelper.ToOpenXRVector(meshScale, false));
+#endif
+#if !UNITY_ANDROID && !UNITY_STANDALONE
+			return false;
 #endif
 		}