diff --git a/frontend/src/components/FilePreview.tsx b/frontend/src/components/FilePreview.tsx
index 19951a5..249ba7b 100644
--- a/frontend/src/components/FilePreview.tsx
+++ b/frontend/src/components/FilePreview.tsx
@@ -94,7 +94,7 @@ export default function FilePreview({ file, onClose, downloadToken }: FilePrevie
           style={{ backgroundColor: 'var(--color-bg-elevated)', border: '1px solid var(--color-border)' }}
         >
           {/* Header */}
-          <div className="flex items-center justify-between px-4 py-3 border-b shrink-0" style={{ borderColor: 'var(--color-border-subtle)', backgroundColor: 'var(--color-bg-secondary)' }}>
+          <div className="w-0 min-w-full flex items-center justify-between px-4 py-3 border-b shrink-0" style={{ borderColor: 'var(--color-border-subtle)', backgroundColor: 'var(--color-bg-secondary)' }}>
             <div className="flex items-center gap-3 min-w-0">
               {getIcon(previewType)}
               <span className="font-medium truncate" style={{ color: 'var(--color-text-primary)' }} title={getFileDisplayName(file.name)}>