diff --git a/src/components/settings/sources.tsx b/src/components/settings/sources.tsx
index 2440a35f..9742f6a3 100644
--- a/src/components/settings/sources.tsx
+++ b/src/components/settings/sources.tsx
@@ -204,7 +204,9 @@ class SourcesTab extends React.Component<SourcesTabProps, SourcesTabState> {
 
     addSource = (event: React.FormEvent) => {
         event.preventDefault()
-        let trimmed = this.state.newUrl.trim()
+        
+        // Remove whitespace and trailing slash
+        const trimmed = this.state.newUrl.trim().replace(/\/$/, '')
         if (urlTest(trimmed)) this.props.addSource(trimmed)
     }