Index: lib/sanitizer_common/sanitizer_linux.cc
===================================================================
--- lib/sanitizer_common/sanitizer_linux.cc
+++ lib/sanitizer_common/sanitizer_linux.cc
@@ -104,7 +104,7 @@
 
 // --------------- sanitizer_libc.h
 uptr internal_mmap(void *addr, uptr length, int prot, int flags, int fd,
-                   u64 offset) {
+                   OFF_T offset) {
 #if SANITIZER_FREEBSD || SANITIZER_LINUX_USES_64BIT_SYSCALLS
   return internal_syscall(SYSCALL(mmap), (uptr)addr, length, prot, flags, fd,
                           offset);
Index: lib/sanitizer_common/sanitizer_posix.h
===================================================================
--- lib/sanitizer_common/sanitizer_posix.h
+++ lib/sanitizer_common/sanitizer_posix.h
@@ -35,7 +35,7 @@
 
 // Memory
 uptr internal_mmap(void *addr, uptr length, int prot, int flags,
-                   int fd, u64 offset);
+                   int fd, OFF_T offset);
 uptr internal_munmap(void *addr, uptr length);
 int internal_mprotect(void *addr, uptr length, int prot);
 
Index: lib/sanitizer_common/sanitizer_posix.cc
===================================================================
--- lib/sanitizer_common/sanitizer_posix.cc
+++ lib/sanitizer_common/sanitizer_posix.cc
@@ -240,7 +240,7 @@
   return internal_iserror(map) ? 0 : (void *)map;
 }
 
-void *MapWritableFileToMemory(void *addr, uptr size, fd_t fd, uptr offset) {
+void *MapWritableFileToMemory(void *addr, uptr size, fd_t fd, OFF_T offset) {
   uptr flags = MAP_SHARED;
   if (addr) flags |= MAP_FIXED;
   uptr p = internal_mmap(addr, size, PROT_READ | PROT_WRITE, flags, fd, offset);