diff --git a/changelogs/unreleased/10735-geo-gitlab-revision-can-return-not-consistent-results.yml b/changelogs/unreleased/10735-geo-gitlab-revision-can-return-not-consistent-results.yml
new file mode 100644
index 00000000000..2360295b022
--- /dev/null
+++ b/changelogs/unreleased/10735-geo-gitlab-revision-can-return-not-consistent-results.yml
@@ -0,0 +1,5 @@
+---
+title: Use a fixed git abbrev parameter when we fetch a git revision
+merge_request: 26707
+author:
+type: fixed
diff --git a/lib/gitlab.rb b/lib/gitlab.rb
index f42ca5a9cd6..1204e53ee2e 100644
--- a/lib/gitlab.rb
+++ b/lib/gitlab.rb
@@ -24,7 +24,7 @@ module Gitlab
       if File.exist?(root.join("REVISION"))
         File.read(root.join("REVISION")).strip.freeze
       else
-        result = Gitlab::Popen.popen_with_detail(%W[#{config.git.bin_path} log --pretty=format:%h -n 1])
+        result = Gitlab::Popen.popen_with_detail(%W[#{config.git.bin_path} log --pretty=format:%h --abbrev=11 -n 1])
 
         if result.status.success?
           result.stdout.chomp.freeze
diff --git a/spec/lib/gitlab_spec.rb b/spec/lib/gitlab_spec.rb
index 8232715d00e..767b5779a79 100644
--- a/spec/lib/gitlab_spec.rb
+++ b/spec/lib/gitlab_spec.rb
@@ -10,7 +10,7 @@ describe Gitlab do
   end
 
   describe '.revision' do
-    let(:cmd) { %W[#{described_class.config.git.bin_path} log --pretty=format:%h -n 1] }
+    let(:cmd) { %W[#{described_class.config.git.bin_path} log --pretty=format:%h --abbrev=11 -n 1] }
 
     around do |example|
       described_class.instance_variable_set(:@_revision, nil)