diff --git a/src/core/BufferGeometry.d.ts b/src/core/BufferGeometry.d.ts
index 135a714d1d34593dbbdfee74f2833caa5782028e..652868f0f8cddd6ba74f2f02fe6310ca9c1a46f0 100644
--- a/src/core/BufferGeometry.d.ts
+++ b/src/core/BufferGeometry.d.ts
@@ -42,8 +42,8 @@ export class BufferGeometry extends EventDispatcher {
 	};
 	morphTargetsRelative: boolean;
 	groups: { start: number; count: number; materialIndex?: number }[];
-	boundingBox: Box3;
-	boundingSphere: Sphere;
+	boundingBox: Box3 | null;
+	boundingSphere: Sphere | null;
 	drawRange: { start: number; count: number };
 	userData: {[key: string]: any};
 	readonly isBufferGeometry: true;
diff --git a/src/core/DirectGeometry.d.ts b/src/core/DirectGeometry.d.ts
index 047407e1c8fb7eaa80c320d214f1e88c422128a5..09e26fc976f7afccf037fbb44be5e56c00fca582 100644
--- a/src/core/DirectGeometry.d.ts
+++ b/src/core/DirectGeometry.d.ts
@@ -27,8 +27,8 @@ export class DirectGeometry {
 	morphTargets: MorphTarget[];
 	skinWeights: Vector4[];
 	skinIndices: Vector4[];
-	boundingBox: Box3;
-	boundingSphere: Sphere;
+	boundingBox: Box3 | null;
+	boundingSphere: Sphere | null;
 	verticesNeedUpdate: boolean;
 	normalsNeedUpdate: boolean;
 	colorsNeedUpdate: boolean;
diff --git a/src/core/Geometry.d.ts b/src/core/Geometry.d.ts
index 3155951f5fec8ee47bdddb2b7b0438a3dd386c62..28fbcfa3afb1d3c980e12857b99f3b0716e09740 100644
--- a/src/core/Geometry.d.ts
+++ b/src/core/Geometry.d.ts
@@ -121,12 +121,12 @@ export class Geometry extends EventDispatcher {
 	/**
 	 * Bounding box.
 	 */
-	boundingBox: Box3;
+	boundingBox: Box3 | null;
 
 	/**
 	 * Bounding sphere.
 	 */
-	boundingSphere: Sphere;
+	boundingSphere: Sphere | null;
 
 	/**
 	 * Set to true if the vertices array has been updated.