diff --git a/packages/typegpu/tests/runtime.test.ts b/packages/typegpu/tests/runtime.test.ts
index 34fab7e9d..6f9184de1 100644
--- a/packages/typegpu/tests/runtime.test.ts
+++ b/packages/typegpu/tests/runtime.test.ts
@@ -6,7 +6,7 @@ import { plum } from '../src/tgpuPlum';
 import './utils/webgpuGlobals';
 
 const mockBuffer = {
-  getMappedRange: vi.fn(() => new ArrayBuffer(8)),
+  getMappedRange: vi.fn(() => new ArrayBuffer(32)),
   unmap: vi.fn(),
   mapAsync: vi.fn(),
 };
diff --git a/packages/typegpu/tests/unmanagedIO.test.ts b/packages/typegpu/tests/unmanagedIO.test.ts
index 4e77da027..f16dd9082 100644
--- a/packages/typegpu/tests/unmanagedIO.test.ts
+++ b/packages/typegpu/tests/unmanagedIO.test.ts
@@ -6,7 +6,7 @@ import './utils/webgpuGlobals';
 const mockBuffer = {
   mapState: 'unmapped',
   usage: GPUBufferUsage.COPY_DST | GPUBufferUsage.COPY_SRC,
-  getMappedRange: vi.fn(() => new ArrayBuffer(8)),
+  getMappedRange: vi.fn(() => new ArrayBuffer(32)),
   unmap: vi.fn(),
   mapAsync: vi.fn(),
   destroy: vi.fn(),
@@ -15,7 +15,7 @@ const mockBuffer = {
 const mockStagingBuffer = {
   mapState: 'unmapped',
   usage: GPUBufferUsage.MAP_READ | GPUBufferUsage.COPY_DST,
-  getMappedRange: vi.fn(() => new ArrayBuffer(8)),
+  getMappedRange: vi.fn(() => new ArrayBuffer(32)),
   unmap: vi.fn(),
   mapAsync: vi.fn(),
   destroy: vi.fn(),