diff --git a/frontend/src/components/TagSidebar.tsx b/frontend/src/components/TagSidebar.tsx
index a4b5b1e..a2e00b2 100644
--- a/frontend/src/components/TagSidebar.tsx
+++ b/frontend/src/components/TagSidebar.tsx
@@ -79,7 +79,7 @@ export default (({ posts }: Props) => {
 		     try
 		     {
 		       const { data } = await axios.get (`${ API_BASE_URL }/posts/random`,
-			   { params: { tags:  tagsQuery.split (' ').filter (e => e !== '').join (','),
+			   { params: { tags:  tagsQuery.split (' ').filter (e => e !== '').join (' '),
 				       match: (anyFlg ? 'any' : 'all') } })
 		       navigate (`/posts/${ (data as Post).id }`)
 		     }