diff --git a/gradle/changelog/sticky_diff_header.yaml b/gradle/changelog/sticky_diff_header.yaml
new file mode 100644
index 0000000000..8f3d4970c0
--- /dev/null
+++ b/gradle/changelog/sticky_diff_header.yaml
@@ -0,0 +1,2 @@
+- type: fixed
+  description: Correct z-index equal weighting in diff header
diff --git a/scm-ui/ui-components/src/repos/LazyDiffFile.tsx b/scm-ui/ui-components/src/repos/LazyDiffFile.tsx
index 5b79682edc..6d7992a01e 100644
--- a/scm-ui/ui-components/src/repos/LazyDiffFile.tsx
+++ b/scm-ui/ui-components/src/repos/LazyDiffFile.tsx
@@ -116,6 +116,7 @@ const PanelHeading = styled.div<{ sticky: boolean }>`
       ? `
    position: sticky;
    top: 52px;
+   z-index: 1;
   `
       : ""}
 `;