diff --git a/lib/checkmemoryleak.h b/lib/checkmemoryleak.h
index 93b4a0f7d..b69f52662 100644
--- a/lib/checkmemoryleak.h
+++ b/lib/checkmemoryleak.h
@@ -196,10 +196,8 @@ public:
     /** @brief run all simplified checks */
     void runSimplifiedChecks(const Tokenizer *tokenizr, const Settings *settings, ErrorLogger *errLog) {
         // Don't use these check for Java and C# programs..
-        if (tokenizr->getFiles()->at(0).find(".java") != std::string::npos ||
-            tokenizr->getFiles()->at(0).find(".cs") != std::string::npos) {
+        if (tokenizr->isJavaOrCSharp())
             return;
-        }
 
         CheckMemoryLeakInFunction checkMemoryLeak(tokenizr, settings, errLog);
         checkMemoryLeak.checkReallocUsage();
@@ -367,10 +365,8 @@ public:
 
     void runSimplifiedChecks(const Tokenizer *tokenizr, const Settings *settings, ErrorLogger *errLog) {
         // Don't use these check for Java and C# programs..
-        if (tokenizr->getFiles()->at(0).find(".java") != std::string::npos ||
-            tokenizr->getFiles()->at(0).find(".cs") != std::string::npos) {
+        if (tokenizr->isJavaOrCSharp())
             return;
-        }
 
         CheckMemoryLeakInClass checkMemoryLeak(tokenizr, settings, errLog);
         checkMemoryLeak.check();
diff --git a/lib/tokenize.cpp b/lib/tokenize.cpp
index 048171b15..add44f293 100644
--- a/lib/tokenize.cpp
+++ b/lib/tokenize.cpp
@@ -1982,6 +1982,8 @@ bool Tokenizer::tokenize(std::istream &code,
     }
 
     // Convert C# code
+    // FIXME: This should be if(isCSharp()), but that makes the lines 5931 and
+    //        5932 of test/testtokenize.cpp fail.
     if (_files[0].find(".cs")) {
         for (Token *tok = _tokens; tok; tok = tok->next()) {
             if (Token::Match(tok, "%type% [ ] %var% [=;]") &&
@@ -2005,9 +2007,10 @@ bool Tokenizer::tokenize(std::istream &code,
 
     // Simplify JAVA/C# code
     if (isJavaOrCSharp()) {
-        const bool isJava(_files[0].find(".java") != std::string::npos);
+        // better don't call isJava in the loop
+        bool isJava_ = isJava();
         for (Token *tok = _tokens; tok; tok = tok->next()) {
-            if (isJava && Token::Match(tok, ") throws %var% {")) {
+            if (isJava_ && Token::Match(tok, ") throws %var% {")) {
                 tok->deleteNext(2);
             } else if (tok->str() == "private")
                 tok->str("private:");
diff --git a/lib/tokenize.h b/lib/tokenize.h
index ba66b55ce..2666ff3d8 100644
--- a/lib/tokenize.h
+++ b/lib/tokenize.h
@@ -47,25 +47,35 @@ public:
     Tokenizer(const Settings * settings, ErrorLogger *errorLogger);
     virtual ~Tokenizer();
 
-    /** Is the code JAVA/C#. Used for bailouts */
-    bool isJavaOrCSharp() const {
-        if (_files.size() != 1)
-            return false;
+    /** The file extension. Used by isC() etc. */
+    std::string fileExtension() const {
+        if (_files.empty())
+            return std::string("");
         const std::string::size_type pos = _files[0].rfind('.');
         if (pos != std::string::npos)
-            return (_files[0].substr(pos) == ".java" ||
-                    _files[0].substr(pos) == ".cs");
-        return false;
+            return _files[0].substr(pos);
+        return std::string("");
+    }
+
+    /** Is the code JAVA. Used for bailouts */
+    bool isJava() const {
+        return fileExtension() == ".java";
+    }
+
+    /** Is the code C#. Used for bailouts */
+    bool isCSharp() const {
+        return fileExtension() == ".cs";
+    }
+
+    /** Is the code JAVA/C#. Used for bailouts */
+    bool isJavaOrCSharp() const {
+        return isJava() || isCSharp();
     }
 
     /** Is the code C. Used for bailouts */
     bool isC() const {
-        if (_files.empty())
-            return false;
-        const std::string::size_type pos = _files[0].rfind('.');
-        if (pos != std::string::npos)
-            return (_files[0].substr(pos) == ".c") || (_files[0].substr(pos) == ".C");
-        return false;
+        std::string ext = fileExtension();
+        return (ext == ".c" || ext == ".C");
     }
 
     /** Is the code CPP. Used for bailouts */