diff --git a/lib/std/heap/logging_allocator.zig b/lib/std/heap/logging_allocator.zig
index d1b7f4776d..7dce7bc20a 100644
--- a/lib/std/heap/logging_allocator.zig
+++ b/lib/std/heap/logging_allocator.zig
@@ -57,7 +57,7 @@ test "LoggingAllocator" {
     var slice_stream = std.io.SliceOutStream.init(buf[0..]);
     const stream = &slice_stream.stream;
 
-    const allocator = &LoggingAllocator.init(std.heap.page_allocator, @ptrCast(*AnyErrorOutStream, stream)).allocator;
+    const allocator = &LoggingAllocator.init(std.testing.allocator, @ptrCast(*AnyErrorOutStream, stream)).allocator;
 
     const ptr = try allocator.alloc(u8, 10);
     allocator.free(ptr);
diff --git a/lib/std/testing.zig b/lib/std/testing.zig
index 4850f2e9b9..f8247b5a9d 100644
--- a/lib/std/testing.zig
+++ b/lib/std/testing.zig
@@ -12,7 +12,7 @@ pub var allocator_instance = LeakCountAllocator.init(&base_allocator_instance.al
 pub const failing_allocator = &FailingAllocator.init(&base_allocator_instance.allocator, 0).allocator;
 
 pub var base_allocator_instance = std.heap.ThreadSafeFixedBufferAllocator.init(allocator_mem[0..]);
-var allocator_mem: [100 * 1024]u8 = undefined;
+var allocator_mem: [512 * 1024]u8 = undefined;
 
 /// This function is intended to be used only in tests. It prints diagnostics to stderr
 /// and then aborts when actual_error_union is not expected_error.
diff --git a/test/cli.zig b/test/cli.zig
index 0527b5c923..b7d03d9e21 100644
--- a/test/cli.zig
+++ b/test/cli.zig
@@ -8,7 +8,7 @@ const ChildProcess = std.ChildProcess;
 var a: *std.mem.Allocator = undefined;
 
 pub fn main() !void {
-    var arena = std.heap.ArenaAllocator.init(std.heap.page_allocator);
+    var arena = std.heap.ArenaAllocator.init(std.testing.allocator);
     defer arena.deinit();
 
     var arg_it = process.args();
diff --git a/test/stage1/behavior/async_fn.zig b/test/stage1/behavior/async_fn.zig
index c7ea183b6f..fb740ead42 100644
--- a/test/stage1/behavior/async_fn.zig
+++ b/test/stage1/behavior/async_fn.zig
@@ -935,12 +935,12 @@ fn recursiveAsyncFunctionTest(comptime suspending_implementation: bool) type {
                 _ = async amain(&result);
                 return result;
             } else {
-                return fib(std.heap.page_allocator, 10) catch unreachable;
+                return fib(std.testing.allocator, 10) catch unreachable;
             }
         }
 
         fn amain(result: *u32) void {
-            var x = async fib(std.heap.page_allocator, 10);
+            var x = async fib(std.testing.allocator, 10);
             result.* = (await x) catch unreachable;
         }
     };