diff --git a/lib/std/debug.zig b/lib/std/debug.zig
index 38a46317116f..62e3810992ac 100644
--- a/lib/std/debug.zig
+++ b/lib/std/debug.zig
@@ -764,7 +764,7 @@ pub noinline fn walkStackWindows(addresses: []usize, existing_context: ?*const w
 
     var i: usize = 0;
     var image_base: usize = undefined;
-    var history_table: windows.UNWIND_HISTORY_TABLE = std.mem.zeroes(windows.UNWIND_HISTORY_TABLE);
+    var history_table = std.mem.zeroes(windows.UNWIND_HISTORY_TABLE);
 
     while (i < addresses.len) : (i += 1) {
         const current_regs = context.getRegs();
diff --git a/lib/std/os/windows.zig b/lib/std/os/windows.zig
index d40fee8db241..dad87f941a06 100644
--- a/lib/std/os/windows.zig
+++ b/lib/std/os/windows.zig
@@ -4104,7 +4104,7 @@ pub const EXCEPTION_ROUTINE = *const fn (
 pub const UNWIND_HISTORY_TABLE_SIZE = 12;
 pub const UNWIND_HISTORY_TABLE_ENTRY = extern struct {
     ImageBase: ULONG64,
-    FunctionEntry: *Self.RUNTIME_FUNCTION,
+    FunctionEntry: ?*Self.RUNTIME_FUNCTION,
 };
 
 pub const UNWIND_HISTORY_TABLE = extern struct {