diff --git a/spine-ts/spine-construct3/src/c3runtime/instance.ts b/spine-ts/spine-construct3/src/c3runtime/instance.ts
index aec084c9f..5a52b1bc4 100644
--- a/spine-ts/spine-construct3/src/c3runtime/instance.ts
+++ b/spine-ts/spine-construct3/src/c3runtime/instance.ts
@@ -167,8 +167,14 @@ class SpineC3Instance extends globalThis.ISDKWorldInstanceBase {
 		while (command) {
 			const { numVertices, positions, uvs, colors, indices, numIndices, blendMode } = command;
 
-			const vertices = this.tempVertices;
-			const c3colors = this.tempColors;
+			const vertices = this.tempVertices.length < numVertices * 3
+				? (this.tempVertices = new Float32Array(numVertices * 3))
+				: this.tempVertices;
+
+			const c3colors = this.tempColors.length < numVertices * 4
+				? (this.tempColors = new Float32Array(numVertices * 4))
+				: this.tempColors;
+
 			for (let i = 0; i < numVertices; i++) {
 				const srcIndex = i * 2;
 				const { x, y } = this.skeletonToC3WorldCoordinates(positions[srcIndex], positions[srcIndex + 1]);