diff --git a/lib/gitlab/git/commit.rb b/lib/gitlab/git/commit.rb
index d899ed3ba25f4ecd45ed118d8cff029cbcc4ce1d..49d3eaa576feaa650c9da7c18d3b9821e17eb37a 100644
--- a/lib/gitlab/git/commit.rb
+++ b/lib/gitlab/git/commit.rb
@@ -432,7 +432,7 @@ def init_from_gitaly(commit)
         @committer_name = commit.committer.name.dup
         @committer_email = commit.committer.email.dup
         @parent_ids = Array(commit.parent_ids)
-        @trailers = commit.trailers.to_h { |t| [t.key, t.value] }
+        @trailers = commit.trailers.to_h { |t| [t.key, encode!(t.value)] }
         @extended_trailers = parse_commit_trailers(commit.trailers)
         @referenced_by = Array(commit.referenced_by)
       end
@@ -440,7 +440,7 @@ def init_from_gitaly(commit)
       # Turn the commit trailers into a hash of key: [value, value] arrays
       def parse_commit_trailers(trailers)
         trailers.each_with_object({}) do |trailer, hash|
-          (hash[trailer.key] ||= []) << trailer.value
+          (hash[trailer.key] ||= []) << encode!(trailer.value)
         end
       end
 
diff --git a/spec/lib/gitlab/git/commit_spec.rb b/spec/lib/gitlab/git/commit_spec.rb
index a924137b8ec74abfd3d6a1fa722d16388b4939a6..767ca360b9675085638d6c4a23c38c26c6c11998 100644
--- a/spec/lib/gitlab/git/commit_spec.rb
+++ b/spec/lib/gitlab/git/commit_spec.rb
@@ -51,6 +51,30 @@
       )
     end
 
+    context 'non-ASCII content' do
+      let(:body) do
+        body = +<<~BODY
+          Äpfel
+
+          Changelog: Äpfel
+        BODY
+
+        [subject, "\n", body.force_encoding("ASCII-8BIT")].join
+      end
+
+      it "parses non-ASCII commit trailers" do
+        expect(commit.trailers).to eq(
+          { 'Changelog' => 'Äpfel' }
+        )
+      end
+
+      it "parses non-ASCII extended commit trailers" do
+        expect(commit.extended_trailers).to eq(
+          { 'Changelog' => ['Äpfel'] }
+        )
+      end
+    end
+
     context 'non-UTC dates' do
       let(:seconds) { Time.now.to_i }