diff --git a/tools/lkl/lib/Build b/tools/lkl/lib/Build
index d22b16cc6353b7..44dff1f1682548 100644
--- a/tools/lkl/lib/Build
+++ b/tools/lkl/lib/Build
@@ -1,3 +1,5 @@
+CFLAGS_posix-host.o += -D_FILE_OFFSET_BITS=64
+
 lkl-y += fs.o
 lkl-y += iomem.o
 lkl-y += net.o