diff --git a/react/src/constants/sources.ts b/react/src/constants/sources.ts
index a8c3972e..d2d3d67f 100644
--- a/react/src/constants/sources.ts
+++ b/react/src/constants/sources.ts
@@ -1,3 +1,3 @@
-const SOURCES = (process.env.REACT_APP_SOURCE_LIST || '').split(',');
+const SOURCES = (process.env.REACT_APP_SOURCE_LIST || '').split(',').map(v => v.trim());
 
 export default SOURCES;