1 files changed, 4 insertions, 4 deletions
diff --git a/lib/info.h b/lib/info.h
index b499421..aec643a 100644
--- a/lib/info.h
+++ b/lib/info.h
@@ -41,10 +41,10 @@ public:
   Info();
   virtual ~Info() {}
 
-  virtual void error(char* fmt, ...) = 0;
-  virtual void warn(char* fmt, ...) = 0;
-  virtual void info(char* fmt, ...) = 0;
-  void log(char* fmt, ...);
+  virtual void error(const char* fmt, ...) = 0;
+  virtual void warn(const char* fmt, ...) = 0;
+  virtual void info(const char* fmt, ...) = 0;
+  void log(const char* fmt, ...);
 
 protected:
   //  MiavConfig *config;