diff --git a/libsparse/output_file.c b/libsparse/output_file.c
index 5014e4a..2428022 100644
--- a/libsparse/output_file.c
+++ b/libsparse/output_file.c
@@ -46,15 +46,6 @@
 #define off64_t off_t
 #endif
 
-#ifdef __BIONIC__
-extern void*  __mmap2(void *, size_t, int, int, int, off_t);
-static inline void *mmap64(void *addr, size_t length, int prot, int flags,
-        int fd, off64_t offset)
-{
-    return __mmap2(addr, length, prot, flags, fd, offset >> 12);
-}
-#endif
-
 #define min(a, b) \
 	({ typeof(a) _a = (a); typeof(b) _b = (b); (_a < _b) ? _a : _b; })