diff --git a/src/libfetchers/git-utils.cc b/src/libfetchers/git-utils.cc
index 65f7b45ef369..b7f45cca56b8 100644
--- a/src/libfetchers/git-utils.cc
+++ b/src/libfetchers/git-utils.cc
@@ -381,9 +381,7 @@ struct GitRepoImpl : GitRepo, std::enable_shared_from_this<GitRepoImpl>
         };
 
         git_fetch_options opts = GIT_FETCH_OPTIONS_INIT;
-        // FIXME: for some reason, shallow fetching over ssh barfs
-        // with "could not read from remote repository".
-        opts.depth = shallow && parseURL(url).scheme != "ssh" ? 1 : GIT_FETCH_DEPTH_FULL;
+        opts.depth = GIT_FETCH_DEPTH_FULL;
         opts.callbacks.payload = &act;
         opts.callbacks.sideband_progress = sidebandProgressCallback;
         opts.callbacks.transfer_progress = transferProgressCallback;
diff --git a/src/libfetchers/git.cc b/src/libfetchers/git.cc
index 01cd284274a2..06be006f6a6f 100644
--- a/src/libfetchers/git.cc
+++ b/src/libfetchers/git.cc
@@ -527,8 +527,6 @@ struct GitInputScheme : InputScheme
                     auto fetchRef =
                         getAllRefsAttr(input)
                         ? "refs/*"
-                        : input.getRev()
-                        ? input.getRev()->gitRev()
                         : ref.compare(0, 5, "refs/") == 0
                         ? ref
                         : ref == "HEAD"
diff --git a/tests/functional/fetchGit.sh b/tests/functional/fetchGit.sh
index 4985c7764f66..c38cd27eb817 100644
--- a/tests/functional/fetchGit.sh
+++ b/tests/functional/fetchGit.sh
@@ -51,7 +51,9 @@ git -C $repo add differentbranch
 git -C $repo commit -m 'Test2'
 git -C $repo checkout master
 devrev=$(git -C $repo rev-parse devtest)
-nix eval --impure --raw --expr "builtins.fetchGit { url = file://$repo; rev = \"$devrev\"; }"
+out=$(nix eval --impure --raw --expr "builtins.fetchGit { url = file://$repo; rev = \"$devrev\"; }" 2>&1) || status=$?
+[[ $status == 1 ]]
+[[ $out =~ 'Cannot find Git revision' ]]
 
 [[ $(nix eval --raw --expr "builtins.readFile (builtins.fetchGit { url = file://$repo; rev = \"$devrev\"; allRefs = true; } + \"/differentbranch\")") = 'different file' ]]