diff --git a/dlls/msvcrt/tests/data.c b/dlls/msvcrt/tests/data.c
index b664edbab18..050a234ce87 100644
--- a/dlls/msvcrt/tests/data.c
+++ b/dlls/msvcrt/tests/data.c
@@ -32,7 +32,6 @@
 #include <errno.h>
 #include <direct.h>
 
-void __cdecl __getmainargs(int *, char ***, char ***, int, int *);
 static int* (__cdecl *p___p___argc)(void);
 static char*** (__cdecl *p___p___argv)(void);
 
diff --git a/include/Makefile.in b/include/Makefile.in
index c4ade26688d..ce0f6fc433a 100644
--- a/include/Makefile.in
+++ b/include/Makefile.in
@@ -424,6 +424,7 @@ SOURCES = \
 	msvcrt/assert.h \
 	msvcrt/conio.h \
 	msvcrt/corecrt.h \
+	msvcrt/corecrt_startup.h \
 	msvcrt/corecrt_stdio_config.h \
 	msvcrt/corecrt_wctype.h \
 	msvcrt/corecrt_wio.h \
diff --git a/include/msvcrt/corecrt_startup.h b/include/msvcrt/corecrt_startup.h
new file mode 100644
index 00000000000..cd374ec10b6
--- /dev/null
+++ b/include/msvcrt/corecrt_startup.h
@@ -0,0 +1,47 @@
+/**
+ * This file has no copyright assigned and is placed in the Public Domain.
+ * This file is part of the Wine project.
+ */
+
+#ifndef _INC_CORECRT_STARTUP
+#define _INC_CORECRT_STARTUP
+
+#include <corecrt.h>
+
+typedef enum _crt_argv_mode
+{
+    _crt_argv_no_arguments,
+    _crt_argv_unexpanded_arguments,
+    _crt_argv_expanded_arguments
+} _crt_argv_mode;
+
+typedef enum _crt_app_type
+{
+    _crt_unknown_app,
+    _crt_console_app,
+    _crt_gui_app
+} _crt_app_type;
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#ifndef _UCRT
+_ACRTIMP void __cdecl __getmainargs(int *, char ***, char ***, int, int *);
+_ACRTIMP void __cdecl __wgetmainargs(int *, wchar_t ***, wchar_t ***, int, int *);
+#define _set_app_type __set_app_type
+#endif /* _UCRT */
+
+_ACRTIMP errno_t   __cdecl _configure_narrow_argv(_crt_argv_mode);
+_ACRTIMP errno_t   __cdecl _configure_wide_argv(_crt_argv_mode);
+_ACRTIMP char    **__cdecl _get_initial_narrow_environment(void);
+_ACRTIMP wchar_t **__cdecl _get_initial_wide_environment(void);
+_ACRTIMP int       __cdecl _initialize_narrow_environment(void);
+_ACRTIMP int       __cdecl _initialize_wide_environment(void);
+_ACRTIMP void      __cdecl _set_app_type(_crt_app_type);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _INC_CORECRT_STARTUP */
diff --git a/include/msvcrt/process.h b/include/msvcrt/process.h
index 2514e242387..f76807b43a6 100644
--- a/include/msvcrt/process.h
+++ b/include/msvcrt/process.h
@@ -8,7 +8,7 @@
 #ifndef __WINE_PROCESS_H
 #define __WINE_PROCESS_H
 
-#include <corecrt.h>
+#include <corecrt_startup.h>
 
 /* Process creation flags */
 #define _P_WAIT    0