diff --git a/photon/libc/sys/magenta/machine/x86_64/crt0.s b/photon/libc/sys/magenta/machine/x86_64/crt0.s
index a5608c1..e54ad16 100644
--- a/photon/libc/sys/magenta/machine/x86_64/crt0.s
+++ b/photon/libc/sys/magenta/machine/x86_64/crt0.s
@@ -8,8 +8,9 @@
 .type main, @function
 
 _start:
-    mov %rsp, %rsi
-    andq $-16, %rsp
+    # Magenta aligns the stack to a page boundry and subtracts 8.
+    # Add 8 to restore 16-byte alignment
+    add $8, %rsp
     call __crt_init
 
     # unreachable; __crt_init() will call mx_task_kill()