diff --git a/src/client/app/common/views/directives/autocomplete.ts b/src/client/app/common/views/directives/autocomplete.ts
index 1a5c5daed..e3016f0b7 100644
--- a/src/client/app/common/views/directives/autocomplete.ts
+++ b/src/client/app/common/views/directives/autocomplete.ts
@@ -222,8 +222,6 @@ class Autocomplete {
 			const trimmedBefore = before.substring(0, before.lastIndexOf(':'));
 			const after = source.substr(caret);
 
-			if (value.startsWith(':')) value = value + ' ';
-
 			// 挿入
 			this.text = trimmedBefore + value + after;