diff --git a/honoka/plugins/simpleprediction.cpp b/honoka/plugins/simpleprediction.cpp
index 73d0efe..3935b18 100644
--- a/honoka/plugins/simpleprediction.cpp
+++ b/honoka/plugins/simpleprediction.cpp
@@ -123,6 +123,7 @@
 {
     if ((!yomi.length()) || (!str.length())) return;
     data.insert(pair<WideString,WideString>(yomi,str));
+    if (data.size() > 200) data.erase(data.begin());
     return;
 }