diff --git a/os/src/server/lx_fs/file.h b/os/src/server/lx_fs/file.h
index f886041bf..85d5e4a05 100644
--- a/os/src/server/lx_fs/file.h
+++ b/os/src/server/lx_fs/file.h
@@ -106,7 +106,7 @@ class File_system::File : public Node
 		{
 			/* should we append? */
 			if (seek_offset == ~0ULL) {
-				off_t off = lseek(_fd, 0, SEEK_END);
+				::off_t off = lseek(_fd, 0, SEEK_END);
 				if (off == -1)
 					return 0;
 				seek_offset = off;
diff --git a/os/src/server/lx_fs/lx_util.h b/os/src/server/lx_fs/lx_util.h
index cc988b78a..a9ce4018f 100644
--- a/os/src/server/lx_fs/lx_util.h
+++ b/os/src/server/lx_fs/lx_util.h
@@ -11,6 +11,7 @@
 #include <file_system_session/file_system_session.h>
 
 /* Linux includes */
+#define _FILE_OFFSET_BITS 64
 #include <errno.h>
 #include <unistd.h>
 #include <fcntl.h>