diff --git a/src/backend/commands/copy.c b/src/backend/commands/copy.c
index c39218f8db..828b9e47f7 100644
--- a/src/backend/commands/copy.c
+++ b/src/backend/commands/copy.c
@@ -2603,13 +2603,12 @@ CopyMultiInsertInfoCleanup(CopyMultiInsertInfo *miinfo)
 }
 
 /*
- * Get the next TupleTableSlot that the next tuple should be stored in.
+ * Get the next free TupleTableSlot in rri's ri_CopyMultiInsertBuffer.
  *
- * Callers must ensure that the buffer is not full.
+ * Callers must ensure that rri's ri_CopyMultiInsertBuffer is not full.
  */
 static inline TupleTableSlot *
-CopyMultiInsertInfoNextFreeSlot(CopyMultiInsertInfo *miinfo,
-								ResultRelInfo *rri)
+CopyMultiInsertInfoNextFreeSlot(ResultRelInfo *rri)
 {
 	CopyMultiInsertBuffer *buffer = rri->ri_CopyMultiInsertBuffer;
 	int			nused = buffer->nused;
@@ -3022,8 +3021,7 @@ CopyFrom(CopyState cstate)
 			Assert(resultRelInfo == target_resultRelInfo);
 			Assert(insertMethod == CIM_MULTI);
 
-			myslot = CopyMultiInsertInfoNextFreeSlot(&multiInsertInfo,
-													 resultRelInfo);
+			myslot = CopyMultiInsertInfoNextFreeSlot(resultRelInfo);
 		}
 
 		/*
@@ -3170,8 +3168,7 @@ CopyFrom(CopyState cstate)
 				/* no other path available for partitioned table */
 				Assert(insertMethod == CIM_MULTI_CONDITIONAL);
 
-				batchslot = CopyMultiInsertInfoNextFreeSlot(&multiInsertInfo,
-															resultRelInfo);
+				batchslot = CopyMultiInsertInfoNextFreeSlot(resultRelInfo);
 
 				if (map != NULL)
 					myslot = execute_attr_map_slot(map->attrMap, myslot,