diff --git a/configure.ac b/configure.ac
index bd42364..2c66a99 100644
--- a/configure.ac
+++ b/configure.ac
@@ -12,6 +12,7 @@ AC_CANONICAL_HOST
 
 AC_PROG_CC
 
+AC_SYS_LARGEFILE
 
 PKG_CHECK_MODULES([LZ4],
 		[liblz4 >= 1.7.1 liblz4 < 100],
diff --git a/src/filepath.h b/src/filepath.h
index 6290bc6..a630e56 100644
--- a/src/filepath.h
+++ b/src/filepath.h
@@ -7,8 +7,6 @@
 #include <wchar.h>
 #endif
 
-#define __USE_LARGEFILE64
-
 #define MAX_SWITCHPATH 0x300
 
 typedef enum {
@@ -22,16 +20,9 @@ inline int fseeko64(FILE *__stream, long long __off, int __whence)
 {
     return _fseeki64(__stream, __off, __whence);
 }
-#elif __APPLE__ || __CYGWIN__ 
-    // OS X file I/O is 64bit
-    #define fseeko64 fseek
-#elif __linux__
-    extern int fseeko64 (FILE *__stream, __off64_t __off, int __whence);
 #else
-    /* fseeko is guaranteed by POSIX, hopefully the OS made their off_t definition 64-bit;
-     * known sane on FreeBSD and OpenBSD.
-     */
-    #define fseeko64 fseeko
+    /* off_t is 64-bit with large file support */
+    #define fseeko64 fseek
 #endif
 
 #ifdef _WIN32
@@ -53,12 +44,12 @@ typedef struct _stati64 os_stat64_t;
 typedef char oschar_t; /* utf-8 */
 typedef DIR osdir_t;
 typedef struct dirent osdirent_t;
-typedef struct stat64 os_stat64_t;
+typedef struct stat os_stat64_t;
 
 #define os_fopen fopen
 #define os_opendir opendir
 #define os_readdir readdir
-#define os_stat stat64
+#define os_stat stat
 #define os_fclose fclose
 
 #define OS_MODE_READ "rb"
@@ -85,4 +76,4 @@ void filepath_os_append(filepath_t *fpath, oschar_t *path);
 void filepath_append(filepath_t *fpath, const char *format, ...);
 void filepath_append_n(filepath_t *fpath, uint32_t n, const char *format, ...);
 void filepath_set(filepath_t *fpath, const char *path);
-oschar_t *filepath_get(filepath_t *fpath);
\ No newline at end of file
+oschar_t *filepath_get(filepath_t *fpath);