diff --git a/std/special/bootstrap.zig b/std/special/bootstrap.zig
index 1fc80f2439e271c0bf9b5f2247fb956f679d0a3c..070a26bf71b83cae8e5765c81d924ff36f7d8e74 100644
--- a/std/special/bootstrap.zig
+++ b/std/special/bootstrap.zig
@@ -57,6 +57,9 @@ extern fn WinMainCRTStartup() noreturn {
 
 // TODO https://github.com/ziglang/zig/issues/265
 fn posixCallMainAndExit() noreturn {
+    if (builtin.os == builtin.Os.freebsd) {
+        @setAlignStack(16);
+    }
     const argc = argc_ptr[0];
     const argv = @ptrCast([*][*]u8, argc_ptr + 1);