diff --git a/lib/std/start.zig b/lib/std/start.zig
index 4c3329a01c..35485a6995 100644
--- a/lib/std/start.zig
+++ b/lib/std/start.zig
@@ -297,6 +297,7 @@ fn _start() callconv(.Naked) noreturn {
             \\ mov fp, #0
             \\ mov lr, #0
             \\ mov x0, sp
+            \\ and sp, x0, #-16
             \\ b %[posixCallMainAndExit]
             ,
             .arm, .armeb, .thumb, .thumbeb =>