diff --git a/syscall.c b/syscall.c
index 96b42b6f..c6fd354b 100644
--- a/syscall.c
+++ b/syscall.c
@@ -128,6 +128,7 @@ int do_fstat(int fd, STRUCT_STAT *st)
 OFF_T do_lseek(int fd, OFF_T offset, int whence)
 {
 #if HAVE_OFF64_T
+	off64_t lseek64();
 	return lseek64(fd, offset, whence);
 #else
 	return lseek(fd, offset, whence);