diff --git a/.changeset/cold-vans-tan.md b/.changeset/cold-vans-tan.md
new file mode 100644
index 00000000000..6359ff20293
--- /dev/null
+++ b/.changeset/cold-vans-tan.md
@@ -0,0 +1,5 @@
+---
+'@astrojs/starlight': patch
+---
+
+Fixes display of long site title on mobile
diff --git a/packages/starlight/components/Header.astro b/packages/starlight/components/Header.astro
index fa87ce89570..47fb43fb16a 100644
--- a/packages/starlight/components/Header.astro
+++ b/packages/starlight/components/Header.astro
@@ -45,6 +45,7 @@ const shouldRenderSearch =
 		/* Avoid clipping focus ring around link inside title wrapper. */
 		padding: 0.25rem;
 		margin: -0.25rem;
+		min-width: 0;
 	}
 
 	.right-group,