diff --git a/google-cloud-spanner-executor/src/main/java/com/google/cloud/executor/spanner/CloudClientExecutor.java b/google-cloud-spanner-executor/src/main/java/com/google/cloud/executor/spanner/CloudClientExecutor.java
index 07e0b894c1..219b795b67 100644
--- a/google-cloud-spanner-executor/src/main/java/com/google/cloud/executor/spanner/CloudClientExecutor.java
+++ b/google-cloud-spanner-executor/src/main/java/com/google/cloud/executor/spanner/CloudClientExecutor.java
@@ -3117,7 +3117,7 @@ private com.google.spanner.executor.v1.ValueList buildStruct(StructReader struct
                   }
                   value.setArrayValue(builder.build());
                   value.setArrayType(
-                          com.google.spanner.v1.Type.newBuilder().setCode(TypeCode.JSON).build());
+                          com.google.spanner.v1.Type.newBuilder().setCode(TypeCode.STRUCT).build());
                 }
                 break;
               default: