diff --git a/src/buffer_manager.cc b/src/buffer_manager.cc
index 02720a3e..bb03ef6d 100644
--- a/src/buffer_manager.cc
+++ b/src/buffer_manager.cc
@@ -110,7 +110,7 @@ CandidateList BufferManager::complete_buffer_name(StringView prefix,
         {
             ByteCount pos = name.find_last_of('/');
             if (pos != (int)String::npos)
-                match_name = name.substr(pos);
+                match_name = name.substr(pos+1);
         }
 
         if (prefix_match(match_name, real_prefix))