diff --git a/src/ext/file_dialog.c b/src/ext/file_dialog.c
index b55a115..0015018 100644
--- a/src/ext/file_dialog.c
+++ b/src/ext/file_dialog.c
@@ -30,6 +30,10 @@
 #include <commdlg.h>
 #include <stdio.h>
 
+FILE* _wfopen(const wchar_t *, const wchar_t *);
+wchar_t* wcsrchr(const wchar_t *, wchar_t);
+wchar_t* wcscpy(wchar_t *, const wchar_t *);
+
 #define UTF8ToString(S) (wchar_t *)SDL_iconv_string("UTF-16LE", "UTF-8", (char *)(S), SDL_strlen(S)+1)
 #define StringToUTF8(S) SDL_iconv_string("UTF-8", "UTF-16LE", (char *)(S), (SDL_wcslen(S)+1)*sizeof(wchar_t))
 
diff --git a/src/fs.c b/src/fs.c
index 44c8f9c..99b0c4a 100644
--- a/src/fs.c
+++ b/src/fs.c
@@ -108,6 +108,9 @@ bool fsIsInPublicDir(FileSystem* fs)
 #define UTF8ToString(S) (wchar_t *)SDL_iconv_string("UTF-16LE", "UTF-8", (char *)(S), SDL_strlen(S)+1)
 #define StringToUTF8(S) SDL_iconv_string("UTF-8", "UTF-16LE", (char *)(S), (SDL_wcslen(S)+1)*sizeof(wchar_t))
 
+FILE* _wfopen(const wchar_t *, const wchar_t *);
+int _wremove(const wchar_t *);
+
 #define TIC_DIR _WDIR
 #define tic_dirent _wdirent
 #define tic_stat_struct _stat