diff --git a/Command/Log.hs b/Command/Log.hs
index 861229183f..397e6068d3 100644
--- a/Command/Log.hs
+++ b/Command/Log.hs
@@ -215,7 +215,7 @@ getGitLog fs os = do
 		, Param "-z"
 		, Param "--pretty=format:%ct"
 		, Param "--raw"
-		, Param "--abbrev=40"
+		, Param "--no-abbrev"
 		] ++ os ++
 		[ Param $ Git.fromRef Annex.Branch.fullname
 		, Param "--"
diff --git a/Database/Keys.hs b/Database/Keys.hs
index afbe7191d5..1c0858e50a 100644
--- a/Database/Keys.hs
+++ b/Database/Keys.hs
@@ -260,7 +260,7 @@ reconcileStaged qh = do
 		, Param "--cached"
 		, Param "--raw"
 		, Param "-z"
-		, Param "--abbrev=40"
+		, Param "--no-abbrev"
 		-- Optimization: Only find pointer files. This is not
 		-- perfect. A file could start with this and not be a
 		-- pointer file. And a pointer file that is replaced with
diff --git a/Git/DiffTree.hs b/Git/DiffTree.hs
index f87504ad0c..bfd1a7a1bc 100644
--- a/Git/DiffTree.hs
+++ b/Git/DiffTree.hs
@@ -77,14 +77,14 @@ diffFiles = getdiff (Param "diff-files")
  - is adjusted to be the same as diff-tree --raw._-}
 diffLog :: [CommandParam] -> Repo -> IO ([DiffTreeItem], IO Bool)
 diffLog params = getdiff (Param "log")
-	(Param "-n1" : Param "--abbrev=40" : Param "--pretty=format:" : params)
+	(Param "-n1" : Param "--no-abbrev" : Param "--pretty=format:" : params)
 
 {- Uses git show to get the changes made by a commit.
  -
  - Does not support merge commits, and will fail on them. -}
 commitDiff :: Sha -> Repo -> IO ([DiffTreeItem], IO Bool)
 commitDiff ref = getdiff (Param "show")
-	[ Param "--abbrev=40", Param "--pretty=", Param "--raw", Param (fromRef ref) ]
+	[ Param "--no-abbrev", Param "--pretty=", Param "--raw", Param (fromRef ref) ]
 
 getdiff :: CommandParam -> [CommandParam] -> Repo -> IO ([DiffTreeItem], IO Bool)
 getdiff command params repo = do