diff --git a/lib/checkclass.cpp b/lib/checkclass.cpp
index 591bed26d..2d88ae183 100644
--- a/lib/checkclass.cpp
+++ b/lib/checkclass.cpp
@@ -1760,7 +1760,7 @@ bool CheckClass::isConstMemberFunc(const Scope *scope, const Token *tok) const
     return false;
 }
 
-bool CheckClass::checkConstFunc(const Scope *scope, const Function *func, bool& memberAccessed)
+bool CheckClass::checkConstFunc(const Scope *scope, const Function *func, bool& memberAccessed) const
 {
     // if the function doesn't have any assignment nor function call,
     // it can be a const function..
diff --git a/lib/checkclass.h b/lib/checkclass.h
index 74f528b59..0370adbb9 100644
--- a/lib/checkclass.h
+++ b/lib/checkclass.h
@@ -213,7 +213,7 @@ private:
     bool isMemberVar(const Scope *scope, const Token *tok) const;
     bool isMemberFunc(const Scope *scope, const Token *tok) const;
     bool isConstMemberFunc(const Scope *scope, const Token *tok) const;
-    bool checkConstFunc(const Scope *scope, const Function *func, bool& memberAccessed);
+    bool checkConstFunc(const Scope *scope, const Function *func, bool& memberAccessed) const;
 
     // constructors helper function
     /** @brief Information about a member variable. Used when checking for uninitialized variables */
diff --git a/lib/checkio.h b/lib/checkio.h
index 12fa4b2f0..e3718749d 100644
--- a/lib/checkio.h
+++ b/lib/checkio.h
@@ -120,7 +120,7 @@ private:
     void invalidPrintfArgTypeError_float(const Token* tok, unsigned int numFormat, const std::string& specifier, const ArgumentInfo* argInfo);
     void invalidLengthModifierError(const Token* tok, unsigned int numFormat, const std::string& modifier);
     void invalidScanfFormatWidthError(const Token* tok, unsigned int numFormat, int width, const Variable *var);
-    void argumentType(std::ostream & s, const ArgumentInfo * argInfo);
+    static void argumentType(std::ostream & s, const ArgumentInfo * argInfo);
 
     void getErrorMessages(ErrorLogger *errorLogger, const Settings *settings) const {
         CheckIO c(0, settings, errorLogger);