diff --git a/modules/gui/qt4/components/simple_preferences.cpp b/modules/gui/qt4/components/simple_preferences.cpp
index 4937dd7b40459629f824e3ae7520a889d3a866cd..7f4d601b0ef6db0342b4e4b441fde5a75321db23 100644
--- a/modules/gui/qt4/components/simple_preferences.cpp
+++ b/modules/gui/qt4/components/simple_preferences.cpp
@@ -794,7 +794,7 @@ void SPrefsPanel::assoDialog()
     listAsso.clear();
 }
 
-void addAsso( QVLCRegistry *qvReg, char *psz_ext )
+void addAsso( QVLCRegistry *qvReg, const char *psz_ext )
 {
     std::string s_path( "VLC" ); s_path += psz_ext;
     std::string s_path2 = s_path;
@@ -833,7 +833,7 @@ void addAsso( QVLCRegistry *qvReg, char *psz_ext )
     }
 }
 
-void delAsso( QVLCRegistry *qvReg, char *psz_ext )
+void delAsso( QVLCRegistry *qvReg, const char *psz_ext )
 {
     char psz_VLC[] = "VLC";
     char *psz_value = qvReg->ReadRegistryString( psz_ext, "", ""  );
diff --git a/modules/gui/qt4/util/registry.cpp b/modules/gui/qt4/util/registry.cpp
index a05f2d3eadf7258a010c3a6928254d54628c256f..263a3bf556eac98eb5e9a51c0c1dd556b72224b2 100644
--- a/modules/gui/qt4/util/registry.cpp
+++ b/modules/gui/qt4/util/registry.cpp
@@ -187,7 +187,7 @@ double QVLCRegistry::ReadRegistryDouble( const char *path, const char *valueName
     return default_value;
 }
 
-int QVLCRegistry::DeleteValue( char *path, char *valueName )
+int QVLCRegistry::DeleteValue( const char *path, const char *valueName )
 {
     HKEY keyHandle;
     long result;
@@ -200,7 +200,7 @@ int QVLCRegistry::DeleteValue( char *path, char *valueName )
     return result;
 }
 
-long QVLCRegistry::DeleteKey( char *path, char *keyName )
+long QVLCRegistry::DeleteKey( const char *path, const char *keyName )
 {
     HKEY keyHandle;
     long result;
diff --git a/modules/gui/qt4/util/registry.hpp b/modules/gui/qt4/util/registry.hpp
index 34188b72d683289e7f21807e6df71a23bfaab2fb..361211ac465baa50084171ae7a08defc47d6de2b 100644
--- a/modules/gui/qt4/util/registry.hpp
+++ b/modules/gui/qt4/util/registry.hpp
@@ -44,8 +44,8 @@ public:
 
     bool RegistryKeyExists( const char *path);
     bool RegistryValueExists( const char *path, const char *valueName);
-    int DeleteValue( char *path, char *valueName );
-    long DeleteKey( char *path, char *keyName );
+    int DeleteValue( const char *path, const char *valueName );
+    long DeleteKey( const char *path, const char *keyName );
 };
 
 #endif