diff --git a/unoidl/IwyuFilter_unoidl.yaml b/unoidl/IwyuFilter_unoidl.yaml
new file mode 100644
index 000000000000..c0f74e5ffdd9
--- /dev/null
+++ b/unoidl/IwyuFilter_unoidl.yaml
@@ -0,0 +1,6 @@
+---
+assumeFilename: unoidl/source/unoidl.cxx
+blacklist:
+    unoidl/source/unoidl-write.cxx:
+    # Avoid loplugin:oslendian error
+    - osl/endian.h