diff --git a/sdk/lib/ucrt/misc/invalid_parameter.cpp b/sdk/lib/ucrt/misc/invalid_parameter.cpp
index 7865ca156db..435115b3664 100644
--- a/sdk/lib/ucrt/misc/invalid_parameter.cpp
+++ b/sdk/lib/ucrt/misc/invalid_parameter.cpp
@@ -276,6 +276,7 @@ extern "C" __declspec(noreturn) void __cdecl _invalid_parameter_noinfo_noreturn(
             EXCEPTION_NONCONTINUABLE);
 
         TerminateProcess(GetCurrentProcess(), STATUS_INVALID_CRUNTIME_PARAMETER);
+        UNREACHABLE;
     }
 
 #else // ^^^ (_M_IX86 || _M_X64) && !_UCRT_ENCLAVE_BUILD ^^^ // vvv Newer Architectures vvv //
diff --git a/sdk/lib/ucrt/startup/exit.cpp b/sdk/lib/ucrt/startup/exit.cpp
index e46e0395d01..cc680c175ff 100644
--- a/sdk/lib/ucrt/startup/exit.cpp
+++ b/sdk/lib/ucrt/startup/exit.cpp
@@ -285,21 +285,25 @@ extern "C" int __cdecl _is_c_termination_complete()
 extern "C" void __cdecl exit(int const return_code)
 {
     common_exit(return_code, _crt_exit_full_cleanup, _crt_exit_terminate_process);
+    UNREACHABLE;
 }
 
 extern "C" void __cdecl _exit(int const return_code)
 {
     common_exit(return_code, _crt_exit_no_cleanup, _crt_exit_terminate_process);
+    UNREACHABLE;
 }
 
 extern "C" void __cdecl _Exit(int const return_code)
 {
     common_exit(return_code, _crt_exit_no_cleanup, _crt_exit_terminate_process);
+    UNREACHABLE;
 }
 
 extern "C" void __cdecl quick_exit(int const return_code)
 {
     common_exit(return_code, _crt_exit_quick_cleanup, _crt_exit_terminate_process);
+    UNREACHABLE;
 }
 
 extern "C" void __cdecl _cexit()