diff --git a/hgext/lfs/__init__.py b/hgext/lfs/__init__.py
--- a/hgext/lfs/__init__.py
+++ b/hgext/lfs/__init__.py
@@ -137,6 +137,7 @@ from mercurial import (
     fileset,
     hg,
     localrepo,
+    merge,
     minifileset,
     node,
     pycompat,
@@ -331,6 +332,8 @@ def extsetup(ui):
     wrapfunction(hg, 'clone', wrapper.hgclone)
     wrapfunction(hg, 'postshare', wrapper.hgpostshare)
 
+    wrapfunction(merge, 'applyupdates', wrapper.mergemodapplyupdates)
+
     # Make bundle choose changegroup3 instead of changegroup2. This affects
     # "hg bundle" command. Note: it does not cover all bundle formats like
     # "packed1". Using "packed1" with lfs will likely cause trouble.
diff --git a/hgext/lfs/wrapper.py b/hgext/lfs/wrapper.py
--- a/hgext/lfs/wrapper.py
+++ b/hgext/lfs/wrapper.py
@@ -249,6 +249,42 @@ def hgpostshare(orig, sourcerepo, destre
     if 'lfs' in destrepo.requirements:
         destrepo.vfs.append('hgrc', util.tonativeeol('\n[extensions]\nlfs=\n'))
 
+def _prefetchfiles(repo, ctx, files):
+    """Ensure that required LFS blobs are present, fetching them as a group if
+    needed.
+
+    This is centralized logic for various prefetch hooks."""
+    pointers = []
+    localstore = repo.svfs.lfslocalblobstore
+
+    for f in files:
+        p = pointerfromctx(ctx, f)
+        if p and not localstore.has(p.oid()):
+            p.filename = f
+            pointers.append(p)
+
+    if pointers:
+        repo.svfs.lfsremoteblobstore.readbatch(pointers, localstore)
+
+def mergemodapplyupdates(orig, repo, actions, wctx, mctx, overwrite,
+                         labels=None):
+    """Ensure that the required LFS blobs are present before applying updates,
+    fetching them as a group if needed.
+
+    This has the effect of ensuring all necessary LFS blobs are present before
+    making working directory changes during an update (including after clone and
+    share) or merge."""
+
+    # Skipping 'a', 'am', 'f', 'r', 'dm', 'e', 'k', 'p' and 'pr', because they
+    # don't touch mctx.  'cd' is skipped, because changed/deleted never resolves
+    # to something from the remote side.
+    oplist = [actions[a] for a in 'g dc dg m'.split()]
+
+    _prefetchfiles(repo, mctx,
+                   [f for sublist in oplist for f, args, msg in sublist])
+
+    return orig(repo, actions, wctx, mctx, overwrite, labels)
+
 def _canskipupload(repo):
     # if remotestore is a null store, upload is a no-op and can be skipped
     return isinstance(repo.svfs.lfsremoteblobstore, blobstore._nullremote)
diff --git a/tests/test-lfs-test-server.t b/tests/test-lfs-test-server.t
--- a/tests/test-lfs-test-server.t
+++ b/tests/test-lfs-test-server.t
@@ -66,10 +66,10 @@ Clear the cache to force a download
   $ cd ../repo2
   $ hg update tip -v
   resolving manifests
-  getting a
   lfs: downloading 31cf46fbc4ecd458a0943c5b4881f1f5a6dd36c53d6167d5b69ac45149b38e5b (12 bytes)
   lfs: adding 31cf46fbc4ecd458a0943c5b4881f1f5a6dd36c53d6167d5b69ac45149b38e5b to the usercache
   lfs: processed: 31cf46fbc4ecd458a0943c5b4881f1f5a6dd36c53d6167d5b69ac45149b38e5b
+  getting a
   lfs: found 31cf46fbc4ecd458a0943c5b4881f1f5a6dd36c53d6167d5b69ac45149b38e5b in the local lfs store
   1 files updated, 0 files merged, 0 files removed, 0 files unresolved
 
@@ -99,17 +99,18 @@ Clear the cache to force a download
   $ rm -rf `hg config lfs.usercache`
   $ hg --repo ../repo1 update tip -v
   resolving manifests
-  getting b
-  lfs: found 31cf46fbc4ecd458a0943c5b4881f1f5a6dd36c53d6167d5b69ac45149b38e5b in the local lfs store
-  getting c
+  lfs: need to transfer 2 objects (39 bytes)
+  lfs: downloading 37a65ab78d5ecda767e8622c248b5dbff1e68b1678ab0e730d5eb8601ec8ad19 (20 bytes)
+  lfs: adding 37a65ab78d5ecda767e8622c248b5dbff1e68b1678ab0e730d5eb8601ec8ad19 to the usercache
+  lfs: processed: 37a65ab78d5ecda767e8622c248b5dbff1e68b1678ab0e730d5eb8601ec8ad19
   lfs: downloading d11e1a642b60813aee592094109b406089b8dff4cb157157f753418ec7857998 (19 bytes)
   lfs: adding d11e1a642b60813aee592094109b406089b8dff4cb157157f753418ec7857998 to the usercache
   lfs: processed: d11e1a642b60813aee592094109b406089b8dff4cb157157f753418ec7857998
+  getting b
+  lfs: found 31cf46fbc4ecd458a0943c5b4881f1f5a6dd36c53d6167d5b69ac45149b38e5b in the local lfs store
+  getting c
   lfs: found d11e1a642b60813aee592094109b406089b8dff4cb157157f753418ec7857998 in the local lfs store
   getting d
-  lfs: downloading 37a65ab78d5ecda767e8622c248b5dbff1e68b1678ab0e730d5eb8601ec8ad19 (20 bytes)
-  lfs: adding 37a65ab78d5ecda767e8622c248b5dbff1e68b1678ab0e730d5eb8601ec8ad19 to the usercache
-  lfs: processed: 37a65ab78d5ecda767e8622c248b5dbff1e68b1678ab0e730d5eb8601ec8ad19
   lfs: found 37a65ab78d5ecda767e8622c248b5dbff1e68b1678ab0e730d5eb8601ec8ad19 in the local lfs store
   3 files updated, 0 files merged, 0 files removed, 0 files unresolved
 
@@ -123,11 +124,6 @@ Test a corrupt file download, but clear 
 
   $ hg --repo ../repo1 update -C tip -v
   resolving manifests
-  getting a
-  lfs: found 31cf46fbc4ecd458a0943c5b4881f1f5a6dd36c53d6167d5b69ac45149b38e5b in the local lfs store
-  getting b
-  lfs: found 31cf46fbc4ecd458a0943c5b4881f1f5a6dd36c53d6167d5b69ac45149b38e5b in the local lfs store
-  getting c
   lfs: downloading d11e1a642b60813aee592094109b406089b8dff4cb157157f753418ec7857998 (19 bytes)
   abort: corrupt remote lfs object: d11e1a642b60813aee592094109b406089b8dff4cb157157f753418ec7857998
   [255]
diff --git a/tests/test-lfs.t b/tests/test-lfs.t
--- a/tests/test-lfs.t
+++ b/tests/test-lfs.t
@@ -760,7 +760,6 @@ Damaging a file required by the update d
   $ hg --config lfs.usercache=emptycache clone -v repo5 fromcorrupt2
   updating to branch default
   resolving manifests
-  getting l
   abort: corrupt remote lfs object: 22f66a3fc0b9bf3f012c814303995ec07099b3a9ce02a7af84b5970811074a3b
   [255]