diff --git a/arch/sim/include/setjmp.h b/arch/sim/include/setjmp.h
index ef5b79d0859..3c252575fe8 100644
--- a/arch/sim/include/setjmp.h
+++ b/arch/sim/include/setjmp.h
@@ -40,7 +40,7 @@
 #if defined(CONFIG_HOST_X86_64) && !defined(CONFIG_SIM_M32)
   /* Storage order: %rbx, %rsp, %rbp, %r12, %r13, %r14, %r15, %rip */
 
-#  define XCPTCONTEXT_REGS    10
+#  define XCPTCONTEXT_REGS    11
 #  define XCPTCONTEXT_SIZE    (8 * XCPTCONTEXT_REGS)
 
 #  ifdef __ASSEMBLY__
@@ -55,6 +55,7 @@
 #    define JB_RIP            (7*8)
 #    define JB_FLAG           (8*8)
 #    define JB_ERRNO          (9*8)
+#    define JB_ALIGN0         (10*8)
 
 #  else
 
@@ -68,6 +69,7 @@
 #    define JB_RIP            (7)
 #    define JB_FLAG           (8)
 #    define JB_ERRNO          (9)
+#    define JB_ALIGN0         (10)
 
 #  endif /* __ASSEMBLY__ */