diff --git a/arch/arm64/src/common/arm64_vectors.S b/arch/arm64/src/common/arm64_vectors.S
index 62c31b4687ac2..b9bc2b2913ad1 100644
--- a/arch/arm64/src/common/arm64_vectors.S
+++ b/arch/arm64/src/common/arm64_vectors.S
@@ -190,6 +190,7 @@ reserved_syscall:
     mov    sp, x0
     b      arm64_exit_exception
 2:
+    mov    x0, sp
     adrp   x5, arm64_fatal_handler
     add    x5, x5, #:lo12:arm64_fatal_handler
     br     x5