diff --git a/.changeset/thin-teams-invent.md b/.changeset/thin-teams-invent.md
new file mode 100644
index 0000000000..8cac7b96e8
--- /dev/null
+++ b/.changeset/thin-teams-invent.md
@@ -0,0 +1,5 @@
+---
+'@openproject/primer-view-components': patch
+---
+
+Avoid increasing description of PageHeader
diff --git a/app/components/primer/open_project/page_header.pcss b/app/components/primer/open_project/page_header.pcss
index f05e83f5ef..c773ea157f 100644
--- a/app/components/primer/open_project/page_header.pcss
+++ b/app/components/primer/open_project/page_header.pcss
@@ -44,7 +44,7 @@
 .PageHeader-description {
   font-size: var(--text-body-size-medium);
   color: var(--fgColor-muted);
-  flex: 1 100%;
+  flex: 1 auto;
 }
 
 .PageHeader-description--underlined-links a {