diff --git a/lib/checkstl.cpp b/lib/checkstl.cpp
index 029369c11..422c6d7a0 100644
--- a/lib/checkstl.cpp
+++ b/lib/checkstl.cpp
@@ -1124,7 +1124,8 @@ void CheckStl::string_c_str()
                 const Variable* var = symbolDatabase->getVariableFromVarId(tok->next()->varId());
                 if (var && var->isPointer())
                     string_c_strError(tok);
-            } else if (Token::Match(tok, "%var% ( !!)") && c_strFuncParam.find(tok->str()) != c_strFuncParam.end() && _settings->isEnabled("performance") && !Token::Match(tok->previous(), "::|.")) { // calling function. TODO: Add support for member functions
+            } else if (Token::Match(tok, "%var% ( !!)") && c_strFuncParam.find(tok->str()) != c_strFuncParam.end() &&
+                       _settings->isEnabled("performance") && !Token::Match(tok->previous(), "::|.") && tok->varId() == 0) { // calling function. TODO: Add support for member functions
                 std::pair<std::multimap<std::string, unsigned int>::const_iterator, std::multimap<std::string, unsigned int>::const_iterator> range = c_strFuncParam.equal_range(tok->str());
                 for (std::multimap<std::string, unsigned int>::const_iterator i = range.first; i != range.second; ++i) {
                     if (i->second == 0)
diff --git a/test/teststl.cpp b/test/teststl.cpp
index 02614b350..c5aad4839 100644
--- a/test/teststl.cpp
+++ b/test/teststl.cpp
@@ -1582,6 +1582,14 @@ private:
                            "[test.cpp:10]: (performance) Passing the result of c_str() to a function that takes std::string as argument 1 is slow and redundant.\n",
                            "", errout.str());
 
+        check("void svgFile(const std::string &content, const std::string &fileName, const double end = 1000., const double start = 0.);\n"
+              "void Bar(std::string filename) {\n"
+              "    std::string str = \"bar\";\n"
+              "    std::ofstream svgFile(filename.c_str(), std::ios::trunc);\n"
+              "    svgFile << \"test\";\n"
+              "}");
+        ASSERT_EQUALS("", errout.str());
+
         check("void Foo(const char* p) {}\n"
               "void Foo(const std::string& str) {Foo(str.c_str());}\n" // Overloaded
               "void Bar() {\n"