diff --git a/Source/Windows/Common/CRT/Misc.cpp b/Source/Windows/Common/CRT/Misc.cpp
index 76f8b997b..79a006878 100644
--- a/Source/Windows/Common/CRT/Misc.cpp
+++ b/Source/Windows/Common/CRT/Misc.cpp
@@ -51,7 +51,7 @@ void InitEnv() {
 __attribute__((used, section(".CRT$FEXB"))) void (*_InitEnv)(void) = InitEnv;
 } // namespace
 
-char*** __p__environ() {
+DLLEXPORT_FUNC(char***, __p__environ, ()) {
   return &EnvArray;
 }
 
diff --git a/Source/Windows/Common/CRT/String.cpp b/Source/Windows/Common/CRT/String.cpp
index 07989092d..3fd981c0b 100644
--- a/Source/Windows/Common/CRT/String.cpp
+++ b/Source/Windows/Common/CRT/String.cpp
@@ -120,11 +120,11 @@ int snprintf(char* stream, size_t n, const char* format, ...) {
   return ret;
 }
 
-char* setlocale(int _Category, const char* _Locale) {
+DLLEXPORT_FUNC(char*, setlocale, (int _Category, const char* _Locale)) {
   return Locale;
 }
 
-int _configthreadlocale(int _Flag) {
+DLLEXPORT_FUNC(int, _configthreadlocale, (int _Flag)) {
   return 0;
 }
 
@@ -138,16 +138,17 @@ DLLEXPORT_FUNC(struct lconv*, localeconv, (void)) {
 
 DLLEXPORT_FUNC(void, _free_locale, (_locale_t _Locale)) {}
 
-wint_t btowc(int) {
+DLLEXPORT_FUNC(wint_t, btowc, (int)) {
   UNIMPLEMENTED();
 }
 
-size_t mbsrtowcs(wchar_t* __restrict__ _Dest, const char** __restrict__ _PSrc, size_t _Count,
-                 mbstate_t* __restrict__ _State) __MINGW_ATTRIB_DEPRECATED_SEC_WARN {
+DLLEXPORT_FUNC(size_t, mbsrtowcs, (wchar_t* __restrict__ _Dest, const char** __restrict__ _PSrc, size_t _Count, mbstate_t* __restrict__ _State))
+__MINGW_ATTRIB_DEPRECATED_SEC_WARN {
   UNIMPLEMENTED();
 }
 
-size_t mbrtowc(wchar_t* __restrict__ _DstCh, const char* __restrict__ _SrcCh, size_t _SizeInBytes, mbstate_t* __restrict__ _State) {
+DLLEXPORT_FUNC(size_t, mbrtowc,
+               (wchar_t* __restrict__ _DstCh, const char* __restrict__ _SrcCh, size_t _SizeInBytes, mbstate_t* __restrict__ _State)) {
   UNIMPLEMENTED();
 }
 
@@ -159,11 +160,11 @@ DLLEXPORT_FUNC(int, _mbtowc_l, (wchar_t* __restrict__ DstCh, const char* __restr
   return 1;
 }
 
-size_t mbrlen(const char* __restrict__ _Ch, size_t _SizeInBytes, mbstate_t* __restrict__ _State) {
+DLLEXPORT_FUNC(size_t, mbrlen, (const char* __restrict__ _Ch, size_t _SizeInBytes, mbstate_t* __restrict__ _State)) {
   UNIMPLEMENTED();
 }
 
-size_t wcrtomb(char* __restrict__ _Dest, wchar_t _Source, mbstate_t* __restrict__ _State) {
+DLLEXPORT_FUNC(size_t, wcrtomb, (char* __restrict__ _Dest, wchar_t _Source, mbstate_t* __restrict__ _State)) {
   UNIMPLEMENTED();
 }
 
@@ -171,7 +172,7 @@ DLLEXPORT_FUNC(errno_t, wcrtomb_s, (size_t* _Retval, char* _Dst, size_t _SizeInB
   UNIMPLEMENTED();
 }
 
-int wctob(wint_t _WCh) {
+DLLEXPORT_FUNC(int, wctob, (wint_t _WCh)) {
   UNIMPLEMENTED();
 }