diff --git a/resources/Materials/Examples/StandardSurface/standard_surface_chess_set.mtlx b/resources/Materials/Examples/StandardSurface/standard_surface_chess_set.mtlx
index 3cbaf02fac..96e8a6580c 100644
--- a/resources/Materials/Examples/StandardSurface/standard_surface_chess_set.mtlx
+++ b/resources/Materials/Examples/StandardSurface/standard_surface_chess_set.mtlx
@@ -1,5 +1,5 @@
 <?xml version="1.0"?>
-<materialx version="1.39" colorspace="lin_rec709">
+<materialx version="1.38" colorspace="lin_rec709">
   <!-- Chess Set geometry and material contributed by Side Effects, artwork by Moeen Sayed and Mujtaba Sayed. -->
 
   <!-- Bishop Black -->