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--- a/src/query/wasatorcl.h
+++ b/src/query/wasatorcl.h
@@ -25,7 +25,7 @@
 
 class RclConfig;
 
-extern Rcl::SearchData *wasaStringToRcl(RclConfig *, const string& stemlang,
+extern Rcl::SearchData *wasaStringToRcl(const RclConfig *, const string& stemlang,
 					const string& query, string &reason,
 					const string& autosuffs = string());
 #endif /* _WASATORCL_H_INCLUDED_ */