diff --git a/src/check.h b/src/check.h
index 3bfd13cb7..5e1038d13 100644
--- a/src/check.h
+++ b/src/check.h
@@ -127,6 +127,9 @@ private:
         return (name() < other->name());
     }
 
+    /** disabled assignment operator */
+    void operator=(const Check &);
+
 };
 
 /// @}
diff --git a/src/checkbufferoverrun.cpp b/src/checkbufferoverrun.cpp
index 31d4a4fe8..cfb044a18 100644
--- a/src/checkbufferoverrun.cpp
+++ b/src/checkbufferoverrun.cpp
@@ -276,7 +276,7 @@ void CheckBufferOverrun::checkScope(const Token *tok, const char *varname[], con
             pattern << varnames << " [ " << strindex << " ]";
 
             int indentlevel2 = 0;
-            while ((tok2 = tok2->next()))
+            while ((tok2 = tok2->next()) != 0)
             {
                 if (tok2->str() == ";" && indentlevel2 == 0)
                     break;
@@ -429,7 +429,7 @@ void CheckBufferOverrun::checkScope(const Token *tok, const char *varname[], con
                 {
                     if (tok2->str()[0] == '\"')
                     {
-                        len += Token::getStrLength(tok2);
+                        len += (int)Token::getStrLength(tok2);
                     }
                 }
                 if (len >= (int)size)
diff --git a/src/checkmemoryleak.h b/src/checkmemoryleak.h
index 418b57b41..1397b2967 100644
--- a/src/checkmemoryleak.h
+++ b/src/checkmemoryleak.h
@@ -56,6 +56,9 @@ private:
     /** Disable the default constructors */
     CheckMemoryLeak(const CheckMemoryLeak &);
 
+    /** disable assignment operator */
+    void operator=(const CheckMemoryLeak &);
+
     /**
      * Report error. Similar with the function Check::reportError
      * @param location the token where the error occurs
diff --git a/src/cppcheck.cpp b/src/cppcheck.cpp
index 59a71d5e7..1e5246c07 100644
--- a/src/cppcheck.cpp
+++ b/src/cppcheck.cpp
@@ -430,7 +430,7 @@ unsigned int CppCheck::check()
             _errorLogger->reportOut("Bailing out from checking " + fname + ": " + e.what());
         }
 
-        _errorLogger->reportStatus(c + 1, _filenames.size());
+        _errorLogger->reportStatus(c + 1, (unsigned int)_filenames.size());
     }
 
     // This generates false positives - especially for libraries
diff --git a/src/preprocessor.cpp b/src/preprocessor.cpp
index d8288d472..bc663b67b 100644
--- a/src/preprocessor.cpp
+++ b/src/preprocessor.cpp
@@ -1373,7 +1373,7 @@ public:
                                 if (_variadic && i == _params.size() - 1)
                                 {
                                     str = "";
-                                    for (unsigned int j = _params.size() - 1; j < params2.size(); ++j)
+                                    for (unsigned int j = (unsigned int)_params.size() - 1; j < params2.size(); ++j)
                                     {
                                         if (optcomma || j > _params.size() - 1)
                                             str += ",";
diff --git a/src/threadexecutor.h b/src/threadexecutor.h
index 5673c9e11..46978fe62 100644
--- a/src/threadexecutor.h
+++ b/src/threadexecutor.h
@@ -70,6 +70,12 @@ public:
     }
 #endif
 
+private:
+    /** disabled copy constructor */
+    ThreadExecutor(const ThreadExecutor &);
+
+    /** disabled assignment operator */
+    void operator=(const ThreadExecutor &);
 };
 
 #endif // THREADEXECUTOR_H
diff --git a/src/tokenize.cpp b/src/tokenize.cpp
index 6e957fb8e..18eac1b2a 100644
--- a/src/tokenize.cpp
+++ b/src/tokenize.cpp
@@ -839,7 +839,7 @@ void Tokenizer::updateClassList()
 
     // Locate class
     const Token *tok1 = tokens();
-    while ((tok1 = Token::findmatch(tok1, pattern_class)))
+    while ((tok1 = Token::findmatch(tok1, pattern_class)) != 0)
     {
         const char *className;
         className = tok1->strAt(1);
diff --git a/src/tokenize.h b/src/tokenize.h
index 94eaf91d7..e50397502 100644
--- a/src/tokenize.h
+++ b/src/tokenize.h
@@ -304,6 +304,12 @@ private:
      */
     void updateClassList();
 
+    /** Disable assignments.. */
+    Tokenizer(const Tokenizer &);
+
+    /** Disable assignment operator */
+    void operator=(const Tokenizer &);
+
     Token *_tokens, *_tokensBack;
     std::map<std::string, unsigned int> _typeSize;
     std::vector<std::string> _files;