diff --git a/lib/checkclass.cpp b/lib/checkclass.cpp
index ab610bc75..8607ce205 100644
--- a/lib/checkclass.cpp
+++ b/lib/checkclass.cpp
@@ -1902,6 +1902,13 @@ bool CheckClass::checkConstFunc(const std::string &classname, const Var *varlist
             }
         }
 
+        // streaming: <<
+        else if (tok1->str() == "<<" && isMemberVar(classname, varlist, tok1->previous()))
+        {
+            isconst = false;
+            break;
+        }
+
         // increment/decrement (member variable?)..
         else if (Token::Match(tok1, "++|--"))
         {
diff --git a/test/testclass.cpp b/test/testclass.cpp
index 6bbaee42f..f65a2e91e 100644
--- a/test/testclass.cpp
+++ b/test/testclass.cpp
@@ -112,7 +112,8 @@ private:
         TEST_CASE(const16); // ticket #1551
         TEST_CASE(const17); // ticket #1552
         TEST_CASE(const18); // ticket #1563
-        TEST_CASE(constoperator);   // operator< can often be const
+        TEST_CASE(constoperator1);  // operator< can often be const
+        TEST_CASE(constoperator2);	// operator<<
         TEST_CASE(constincdec);     // increment/decrement => non-const
         TEST_CASE(constReturnReference);
         TEST_CASE(constDelete);     // delete member variable => not const
@@ -2241,7 +2242,7 @@ private:
     }
 
     // operator< can often be const
-    void constoperator()
+    void constoperator1()
     {
         checkConst("struct Fred {\n"
                    "    int a;\n"
@@ -2250,6 +2251,22 @@ private:
         ASSERT_EQUALS("[test.cpp:3]: (style) The function 'Fred::operator<' can be const\n", errout.str());
     }
 
+    // operator<<
+    void constoperator2()
+    {
+        checkConst("struct Foo {\n"
+                   "    void operator<<(int);\n"
+                   "};\n"
+                   "struct Fred {\n"
+                   "    Foo foo;\n"
+                   "    void x()\n"
+                   "    {\n"
+                   "        foo << 123;\n"
+                   "    }\n"
+                   "};\n");
+        ASSERT_EQUALS("", errout.str());
+    }
+
     void const5()
     {
         // ticket #1482