diff --git a/lib/std/mem/Allocator.zig b/lib/std/mem/Allocator.zig
index 80341ecc2fa30523ef26bf7f1f68087fea18b925..486c69966e0e3d9bccf1b99e92d404cc36363283 100644
--- a/lib/std/mem/Allocator.zig
+++ b/lib/std/mem/Allocator.zig
@@ -587,4 +587,7 @@ fn unreachableFree(
 test failing {
     const f: Allocator = .failing;
     try std.testing.expectError(error.OutOfMemory, f.alloc(u8, 123));
+    // Expect very large allocations to fail at the implementation level and not in the interface
+    try std.testing.expectError(error.OutOfMemory, f.alloc(u8, std.math.maxInt(usize)));
+    try std.testing.expectError(error.OutOfMemory, f.allocSentinel(u8, std.math.maxInt(usize) - 1, 0));
 }