diff --git a/sdk/include/vcruntime/eh.h b/sdk/include/vcruntime/eh.h
index d37f86e81a0..307822930d3 100644
--- a/sdk/include/vcruntime/eh.h
+++ b/sdk/include/vcruntime/eh.h
@@ -16,6 +16,10 @@
 #error eh.h is only for C++!
 #endif
 
+extern "C++" {
+    _VCRT_EXPORT_STD class type_info;
+}
+
 typedef void (__cdecl *terminate_function)(void);
 typedef void (__cdecl *terminate_handler)(void);
 typedef void (__cdecl *unexpected_function)(void);
diff --git a/sdk/include/vcruntime/vcruntime.h b/sdk/include/vcruntime/vcruntime.h
index 3344cec75ee..cd7d5913407 100644
--- a/sdk/include/vcruntime/vcruntime.h
+++ b/sdk/include/vcruntime/vcruntime.h
@@ -1,6 +1,14 @@
+/*
+ * PROJECT:     ReactOS SDK
+ * LICENSE:     MIT (https://spdx.org/licenses/MIT)
+ * PURPOSE:     Common definitions
+ * COPYRIGHT:   Copyright 2024 Timo Kreuzer (timo.kreuzer@reactos.org)
+ */
 
 #pragma once
 
+#define _VCRUNTIME_H
+
 #include <_mingw.h>
 #include <sal.h>
 #include <vadefs.h>
@@ -70,6 +78,12 @@ _CRT_BEGIN_C_HEADER
 #endif
 #endif
 
+#ifdef _BUILD_STD_MODULE
+ #define _VCRT_EXPORT_STD export
+#else
+ #define _VCRT_EXPORT_STD
+#endif
+
 #ifdef __GNUC__
 #define _CRT_DEPRECATE_TEXT(_Text) __attribute__ ((deprecated))
 #elif defined(_MSC_VER)
diff --git a/sdk/include/vcruntime/vcruntime_startup.h b/sdk/include/vcruntime/vcruntime_startup.h
index f84012e542e..77d53acd474 100644
--- a/sdk/include/vcruntime/vcruntime_startup.h
+++ b/sdk/include/vcruntime/vcruntime_startup.h
@@ -1,6 +1,16 @@
+/*
+ * PROJECT:     ReactOS SDK
+ * LICENSE:     MIT (https://spdx.org/licenses/MIT)
+ * PURPOSE:     Definitions for CRT startup functionality
+ * COPYRIGHT:   Copyright 2024 Timo Kreuzer (timo.kreuzer@reactos.org)
+ */
 
 #pragma once
 
+#include <vcruntime.h>
+
+_CRT_BEGIN_C_HEADER
+
 typedef enum _crt_argv_mode
 {
     _crt_argv_no_arguments,
@@ -21,4 +31,9 @@ typedef enum _crt_exit_return_mode
     _crt_exit_return_to_caller
 } _crt_exit_return_mode;
 
+__vcrt_bool __cdecl __vcrt_initialize(void);
 __vcrt_bool __cdecl __vcrt_uninitialize(_In_ __vcrt_bool _Terminating);
+
+int __cdecl __isa_available_init(void);
+
+_CRT_END_C_HEADER