diff --git a/.changeset/lucky-pumas-cross.md b/.changeset/lucky-pumas-cross.md
new file mode 100644
index 0000000000..4a8e0c5f2f
--- /dev/null
+++ b/.changeset/lucky-pumas-cross.md
@@ -0,0 +1,5 @@
+---
+'@backstage/core-components': patch
+---
+
+Fixed invalid wrap in DismissableBanner component
diff --git a/packages/core-components/src/components/DismissableBanner/DismissableBanner.tsx b/packages/core-components/src/components/DismissableBanner/DismissableBanner.tsx
index be8e613b61..b2d0c68d17 100644
--- a/packages/core-components/src/components/DismissableBanner/DismissableBanner.tsx
+++ b/packages/core-components/src/components/DismissableBanner/DismissableBanner.tsx
@@ -56,6 +56,7 @@ const useStyles = makeStyles(
     content: {
       width: '100%',
       maxWidth: 'inherit',
+      flexWrap: 'nowrap',
     },
     message: {
       display: 'flex',