diff --git a/src/backend/storage/smgr/smgr.c b/src/backend/storage/smgr/smgr.c
index dba8c39..1cc28b4 100644
--- a/src/backend/storage/smgr/smgr.c
+++ b/src/backend/storage/smgr/smgr.c
@@ -646,12 +646,6 @@ void
 smgrtruncate(SMgrRelation reln, ForkNumber forknum, BlockNumber nblocks)
 {
 	/*
-	 * Get rid of any buffers for the about-to-be-deleted blocks. bufmgr will
-	 * just drop them without bothering to write the contents.
-	 */
-	DropRelFileNodeBuffers(reln->smgr_rnode, forknum, nblocks);
-
-	/*
 	 * Send a shared-inval message to force other backends to close any smgr
 	 * references they may have for this rel.  This is useful because they
 	 * might have open file pointers to segments that got removed, and/or
@@ -667,6 +661,12 @@ smgrtruncate(SMgrRelation reln, ForkNumber forknum, BlockNumber nblocks)
 	 * Do the truncation.
 	 */
 	smgrsw[reln->smgr_which].smgr_truncate(reln, forknum, nblocks);
+
+	/*
+	 * Get rid of any buffers for the about-to-be-deleted blocks. bufmgr will
+	 * just drop them without bothering to write the contents.
+	 */
+	DropRelFileNodeBuffers(reln->smgr_rnode, forknum, nblocks);
 }
 
 /*