diff --git a/libc/include/unistd.h b/libc/include/unistd.h
index 75541980d..d90e73717 100644
--- a/libc/include/unistd.h
+++ b/libc/include/unistd.h
@@ -131,7 +131,7 @@ extern int sync(void);
 
 extern int close(int);
 extern off_t lseek(int, off_t, int);
-extern loff_t lseek64(int, loff_t, int);
+extern off64_t lseek64(int, off64_t, int);
 
 extern ssize_t read(int, void *, size_t);
 extern ssize_t write(int, const void *, size_t);
diff --git a/libc/unistd/lseek64.c b/libc/unistd/lseek64.c
index 017b33185..db0c41352 100644
--- a/libc/unistd/lseek64.c
+++ b/libc/unistd/lseek64.c
@@ -29,7 +29,7 @@
 
 extern int __llseek(int fd, unsigned long  offset_hi, unsigned long  offset_lo, loff_t*  result, int  whence);
 
-loff_t lseek64(int fd, loff_t off, int whence)
+off64_t lseek64(int fd, off64_t off, int whence)
 {
     loff_t  result;