2 files changed, 5 insertions, 5 deletions
diff --git a/src/utils/image.cpp b/src/utils/image.cpp
index 4146e0e4..93808f2e 100644
--- a/src/utils/image.cpp
+++ b/src/utils/image.cpp
@@ -58,7 +58,7 @@ namespace usdx
 		}
 	}
 
-	void Image::load(void)
+	void Image::load(void) const
 	{
 		BinaryFile file(filename);
 
@@ -73,7 +73,7 @@ namespace usdx
 		}
 	}
 
-	SDL_Surface* Image::get_surface(void)
+	const SDL_Surface* Image::get_surface(void) const
 	{
 		if (surface == NULL) {
 			load();
diff --git a/src/utils/image.hpp b/src/utils/image.hpp
index e27dc49d..b968652c 100644
--- a/src/utils/image.hpp
+++ b/src/utils/image.hpp
@@ -51,15 +51,15 @@ namespace usdx
 		static log4cpp::Category&  log;
 
 		boost::filesystem::wpath filename;
-		SDL_Surface* surface;
+		mutable SDL_Surface* surface;
 
-		void load(void);
+		void load(void) const;
 
 	public:
 		Image(boost::filesystem::wpath filename);
 		virtual ~Image();
 
-		SDL_Surface* get_surface(void);
+		const SDL_Surface* get_surface(void) const;
 	};
 };