diff --git a/std/heap.zig b/std/heap.zig
index 255c25c2795000902656b28402e9a2d83321ba3b..1e539bf4b18a5ed387586a9ad8ee6b31ecd08c42 100644
--- a/std/heap.zig
+++ b/std/heap.zig
@@ -609,7 +609,7 @@ test "ArenaAllocator" {
     try testAllocatorAlignedShrink(&arena_allocator.allocator);
 }
 
-var test_fixed_buffer_allocator_memory: [30000 * @sizeOf(usize)]u8 = undefined;
+var test_fixed_buffer_allocator_memory: [40000 * @sizeOf(usize)]u8 = undefined;
 test "FixedBufferAllocator" {
     var fixed_buffer_allocator = FixedBufferAllocator.init(test_fixed_buffer_allocator_memory[0..]);