diff --git a/src/reader/spirv/parser_impl_module_var_test.cc b/src/reader/spirv/parser_impl_module_var_test.cc
index df03435..a8c683c 100644
--- a/src/reader/spirv/parser_impl_module_var_test.cc
+++ b/src/reader/spirv/parser_impl_module_var_test.cc
@@ -370,6 +370,7 @@
   OpEntryPoint Vertex %main "main" %1
 
  ;  scramble the member indices
+  OpDecorate %10 Block
   OpMemberDecorate %10 0 BuiltIn ClipDistance
   OpMemberDecorate %10 1 BuiltIn CullDistance
   OpMemberDecorate %10 2 BuiltIn Position