diff --git a/lib/checkother.cpp b/lib/checkother.cpp
index f3d5bbaa8..c88d2d127 100644
--- a/lib/checkother.cpp
+++ b/lib/checkother.cpp
@@ -1978,7 +1978,7 @@ void CheckOther::checkConstantFunctionParameter()
         //       namespace and add them to the pattern. There are
         //       streams for example (however it seems strange with
         //       const stream parameter).
-        if (Token::Match(tok, "std :: string|wstring")) {
+        if (Token::Match(tok, "std :: string|wstring !!::")) {
             passedByValueError(tok, var->name());
         } else if (Token::Match(tok, "std :: %type% <") && !Token::simpleMatch(tok->linkAt(3), "> ::")) {
             passedByValueError(tok, var->name());
diff --git a/test/testother.cpp b/test/testother.cpp
index e5a21c0c8..05936db23 100644
--- a/test/testother.cpp
+++ b/test/testother.cpp
@@ -1577,6 +1577,9 @@ private:
         testPassedByValue("void f(const std::string str) {}");
         ASSERT_EQUALS("[test.cpp:1]: (performance) Function parameter 'str' should be passed by reference.\n", errout.str());
 
+        testPassedByValue("void f(const std::string::size_type x) {}");
+        ASSERT_EQUALS("", errout.str());
+
         testPassedByValue("class Foo;\nvoid f(const Foo foo) {}");
         ASSERT_EQUALS("[test.cpp:2]: (performance) Function parameter 'foo' should be passed by reference.\n", errout.str());