diff --git a/app/helpers/pages_helper.rb b/app/helpers/pages_helper.rb
index 3eaafbdc..51a9423f 100644
--- a/app/helpers/pages_helper.rb
+++ b/app/helpers/pages_helper.rb
@@ -7,6 +7,6 @@ def git_commit_sha
 
   def git_commit_sha_short
     full_sha = git_commit_sha
-    full_sha[-7..]
+    full_sha[...7]
   end
 end
diff --git a/spec/system/pages_spec.rb b/spec/system/pages_spec.rb
index ff8de8e8..a34147d1 100644
--- a/spec/system/pages_spec.rb
+++ b/spec/system/pages_spec.rb
@@ -19,7 +19,7 @@
 
   context "when .source_version file does not exist" do
     let(:sha) { "94d92356828a56db25fccff9d50f41c525eead5x" }
-    let(:expected_text) { "5eead5x" }
+    let(:expected_text) { "94d9235" }
 
     before do
       # stub this method since we need to control what the sha actually is
@@ -31,7 +31,7 @@
 
   context "when .source_version file exists" do
     let(:sha) { "94d92356828a56db25fccff9d50f41c525eead5y" }
-    let(:expected_text) { "5eead5y" }
+    let(:expected_text) { "94d9235" }
 
     before { `cd #{Rails.root} && echo #{sha} > .source_version` }