diff --git a/dic/compdic.h b/dic/compdic.h
index e185218..709b49b 100644
--- a/dic/compdic.h
+++ b/dic/compdic.h
@@ -31,8 +31,8 @@
 #include "dic_internals.h"
 #include "logging.h"
 
-class DicEdge;
-class DictHeaderInfo;
+struct DicEdge;
+struct DictHeaderInfo;
 class Header;
 
 using namespace std;
diff --git a/dic/dic.h b/dic/dic.h
index 1b86f89..2325ec8 100644
--- a/dic/dic.h
+++ b/dic/dic.h
@@ -44,7 +44,7 @@ typedef unsigned char dic_code_t;
 struct params_cross_t;
 struct params_7plus1_t;
 struct params_regexp_t;
-class DicEdge;
+struct DicEdge;
 
 /**
  * A wdstring is a display string, i.e. it can contain more chars than
diff --git a/dic/grammar.h b/dic/grammar.h
index b96cee2..4150925 100644
--- a/dic/grammar.h
+++ b/dic/grammar.h
@@ -23,7 +23,7 @@
 
 class Dictionary;
 class Node;
-class searchRegExpLists;
+struct searchRegExpLists;
 
 bool parseRegexp(const Dictionary &iDic,
                  const wchar_t *input,