diff --git a/src/libexpr/primops/fetchTree.cc b/src/libexpr/primops/fetchTree.cc
index e6f637a43..d094edf92 100644
--- a/src/libexpr/primops/fetchTree.cc
+++ b/src/libexpr/primops/fetchTree.cc
@@ -39,7 +39,7 @@ void emitTreeAttrs(
         // Backwards compat for `builtins.fetchGit`: dirty repos return an empty sha1 as rev
         auto emptyHash = Hash(htSHA1);
         mkString(*state.allocAttr(v, state.symbols.create("rev")), emptyHash.gitRev());
-        mkString(*state.allocAttr(v, state.symbols.create("shortRev")), emptyHash.gitRev());
+        mkString(*state.allocAttr(v, state.symbols.create("shortRev")), emptyHash.gitShortRev());
     }
 
     if (input.getType() == "git")
diff --git a/tests/fetchGit.sh b/tests/fetchGit.sh
index cedd796f7..76390fa59 100644
--- a/tests/fetchGit.sh
+++ b/tests/fetchGit.sh
@@ -59,6 +59,7 @@ path2=$(nix eval --impure --raw --expr "(builtins.fetchGit file://$repo).outPath
 
 [[ $(nix eval --impure --expr "(builtins.fetchGit file://$repo).revCount") = 2 ]]
 [[ $(nix eval --impure --raw --expr "(builtins.fetchGit file://$repo).rev") = $rev2 ]]
+[[ $(nix eval --impure --raw --expr "(builtins.fetchGit file://$repo).shortRev") = ${rev2:0:7} ]]
 
 # Fetching with a explicit hash should succeed.
 path2=$(nix eval --refresh --raw --expr "(builtins.fetchGit { url = file://$repo; rev = \"$rev2\"; }).outPath")
@@ -132,6 +133,7 @@ path2=$(nix eval --impure --raw --expr "(builtins.fetchGit file://$repo).outPath
 path3=$(nix eval --impure --raw --expr "(builtins.fetchGit $repo).outPath")
 # (check dirty-tree handling was used)
 [[ $(nix eval --impure --raw --expr "(builtins.fetchGit $repo).rev") = 0000000000000000000000000000000000000000 ]]
+[[ $(nix eval --impure --raw --expr "(builtins.fetchGit $repo).shortRev") = 0000000 ]]
 
 # Committing shouldn't change store path, or switch to using 'master'
 git -C $repo commit -m 'Bla5' -a