diff --git a/src/include/nodes/nodes.h b/src/include/nodes/nodes.h
index f7b009ec43..6a4d82f0a8 100644
--- a/src/include/nodes/nodes.h
+++ b/src/include/nodes/nodes.h
@@ -284,7 +284,6 @@ typedef enum NodeTag
 	/*
 	 * TAGS FOR MEMORY NODES (memnodes.h)
 	 */
-	T_MemoryContext,
 	T_AllocSetContext,
 	T_SlabContext,
 	T_GenerationContext,