diff --git a/src/unix/linux-syscalls.c b/src/unix/linux-syscalls.c
index 566e1f37..89998ded 100644
--- a/src/unix/linux-syscalls.c
+++ b/src/unix/linux-syscalls.c
@@ -444,18 +444,18 @@ int uv__utimesat(int dirfd,
 }
 
 
-ssize_t uv__preadv(int fd, const struct iovec *iov, int iovcnt, off_t offset) {
+ssize_t uv__preadv(int fd, const struct iovec *iov, int iovcnt, int64_t offset) {
 #if defined(__NR_preadv)
-  return syscall(__NR_preadv, fd, iov, iovcnt, offset);
+  return syscall(__NR_preadv, fd, iov, iovcnt, (long)offset, (long)(offset >> 32));
 #else
   return errno = ENOSYS, -1;
 #endif
 }
 
 
-ssize_t uv__pwritev(int fd, const struct iovec *iov, int iovcnt, off_t offset) {
+ssize_t uv__pwritev(int fd, const struct iovec *iov, int iovcnt, int64_t offset) {
 #if defined(__NR_pwritev)
-  return syscall(__NR_pwritev, fd, iov, iovcnt, offset);
+  return syscall(__NR_pwritev, fd, iov, iovcnt, (long)offset, (long)(offset >> 32));
 #else
   return errno = ENOSYS, -1;
 #endif
diff --git a/src/unix/linux-syscalls.h b/src/unix/linux-syscalls.h
index 6f249b72..96e79439 100644
--- a/src/unix/linux-syscalls.h
+++ b/src/unix/linux-syscalls.h
@@ -151,8 +151,8 @@ int uv__utimesat(int dirfd,
                  const char* path,
                  const struct timespec times[2],
                  int flags);
-ssize_t uv__preadv(int fd, const struct iovec *iov, int iovcnt, off_t offset);
-ssize_t uv__pwritev(int fd, const struct iovec *iov, int iovcnt, off_t offset);
+ssize_t uv__preadv(int fd, const struct iovec *iov, int iovcnt, int64_t offset);
+ssize_t uv__pwritev(int fd, const struct iovec *iov, int iovcnt, int64_t offset);
 int uv__dup3(int oldfd, int newfd, int flags);
 
 #endif /* UV_LINUX_SYSCALL_H_ */