diff --git a/japanese/zinnia/files/patch-trainer.cpp b/japanese/zinnia/files/patch-trainer.cpp
new file mode 100644
index 000000000000..982e03df81d9
--- /dev/null
+++ b/japanese/zinnia/files/patch-trainer.cpp
@@ -0,0 +1,20 @@
+--- trainer.cpp.orig	2010-05-09 05:34:08 UTC
++++ trainer.cpp
+@@ -93,7 +93,7 @@ class TrainerImpl: public Trainer {
+ 
+  public:
+   bool add(const Character &character) {
+-    const std::string y = character.value();
++    std::string y = character.value();
+     CHECK_FALSE(!y.empty()) << "input character is empty";
+     Features features;
+     CHECK_FALSE(features.read(character)) << "cannot read character: " << y;
+@@ -103,7 +103,7 @@ class TrainerImpl: public Trainer {
+     if (!fn) {
+       return false;
+     }
+-    x_.push_back(std::make_pair<std::string, FeatureNode *>(y, fn));
++    x_.push_back(std::make_pair(y, fn));
+     return true;
+   }
+