diff --git a/cpp/devices/disk.h b/cpp/devices/disk.h
index 4b9e9faf..a69a4662 100644
--- a/cpp/devices/disk.h
+++ b/cpp/devices/disk.h
@@ -112,7 +112,7 @@ protected:
 
 	void SetUpCache(off_t, bool = false);
 	void ResizeCache(const string&, bool);
-        bool GetRawMode() { return (cache?cache->GetRawMode():false); }
+        bool GetRawMode() const { return (cache?cache->GetRawMode():false); }
 	void SetUpModePages(map<int, vector<byte>>&, int, bool) const override;
 	void AddErrorPage(map<int, vector<byte>>&, bool) const;
 	virtual void AddFormatPage(map<int, vector<byte>>&, bool) const;
diff --git a/cpp/devices/disk_cache.h b/cpp/devices/disk_cache.h
index b1f299c5..d25eb2f0 100644
--- a/cpp/devices/disk_cache.h
+++ b/cpp/devices/disk_cache.h
@@ -51,7 +51,7 @@ public:
 	~DiskCache() = default;
 
 	void SetRawMode(bool b) { cd_raw = b; }		// CD-ROM raw mode setting
-	bool GetRawMode() { return cd_raw; }
+	bool GetRawMode() const { return cd_raw; }
 
 	bool Save();							// Save and release all
 	bool ReadSector(span<uint8_t>, uint32_t);			// Sector Read