diff --git a/src/CBot/CBotClass.h b/src/CBot/CBotClass.h
index fbf03f1f..d62240d3 100644
--- a/src/CBot/CBotClass.h
+++ b/src/CBot/CBotClass.h
@@ -307,7 +307,7 @@ public:
      * \brief Get the list of user-defined methods in this class.
      * \return List of methods, can be empty.
      */
-    const std::list<CBotFunction*>& GetFunctions();
+    const std::list<CBotFunction*>& GetFunctions() const;
 
     /*!
      * \brief CompileDefItem
diff --git a/src/CBot/CBotInstr/CBotFunction.cpp b/src/CBot/CBotInstr/CBotFunction.cpp
index 5028fa1b..631b1438 100644
--- a/src/CBot/CBotInstr/CBotFunction.cpp
+++ b/src/CBot/CBotInstr/CBotFunction.cpp
@@ -77,13 +77,13 @@ bool CBotFunction::IsPublic()
 }
 
 ////////////////////////////////////////////////////////////////////////////////
-bool CBotFunction::IsProtected()
+bool CBotFunction::IsProtected() const
 {
     return m_bProtect;
 }
 
 ////////////////////////////////////////////////////////////////////////////////
-bool CBotFunction::IsPrivate()
+bool CBotFunction::IsPrivate() const
 {
     return m_bPrivate;
 }
@@ -1206,7 +1206,7 @@ std::string CBotFunction::GetParams()
 }
 
 ////////////////////////////////////////////////////////////////////////////////
-const std::string& CBotFunction::GetClassName()
+const std::string& CBotFunction::GetClassName() const
 {
     return m_MasterClass;
 }
diff --git a/src/CBot/CBotInstr/CBotFunction.h b/src/CBot/CBotInstr/CBotFunction.h
index 29c2b15d..4c2ae3f0 100644
--- a/src/CBot/CBotInstr/CBotFunction.h
+++ b/src/CBot/CBotInstr/CBotFunction.h
@@ -275,7 +275,7 @@ public:
      * \brief Get the name of the class for a method.
      * \return The name of a class or empty string if it's not a method.
      */
-    const std::string& GetClassName();
+    const std::string& GetClassName() const;
 
     /*!
      * \brief IsPublic
@@ -287,13 +287,13 @@ public:
      * \brief Check if a method is protected.
      * \return true if a method was compiled with "protected" keyword.
      */
-    bool IsProtected();
+    bool IsProtected() const;
 
     /*!
      * \brief Check if a method is private.
      * \return true if a method was compiled with "private" keyword.
      */
-    bool IsPrivate();
+    bool IsPrivate() const;
 
     /*!
      * \brief IsExtern