diff --git a/lib/tokenize.cpp b/lib/tokenize.cpp
index 2fef6c1f2..96e225f82 100644
--- a/lib/tokenize.cpp
+++ b/lib/tokenize.cpp
@@ -983,6 +983,23 @@ void Tokenizer::simplifyTemplates()
                 }
                 const std::string type2(s);
 
+                if (type.size() != types2.size())
+                {
+                    std::list<ErrorLogger::ErrorMessage::FileLocation> locationList;
+                    ErrorLogger::ErrorMessage::FileLocation loc;
+                    loc.line = tok2->linenr();
+                    loc.file = file(tok2);
+                    locationList.push_back(loc);
+
+                    const ErrorLogger::ErrorMessage errmsg(locationList,
+                                                           "error",
+                                                           "Internal error: failed to instantiate template. The checking continues anyway.",
+                                                           "internalError");
+
+                    _errorLogger->reportErr(errmsg);
+                    break;
+                }
+
                 // New classname/funcname..
                 const std::string name2(name + "<" + type2 + ">");
 
diff --git a/test/testsimplifytokens.cpp b/test/testsimplifytokens.cpp
index c4cd724d2..c36caf0d1 100644
--- a/test/testsimplifytokens.cpp
+++ b/test/testsimplifytokens.cpp
@@ -91,6 +91,7 @@ private:
         TEST_CASE(template15);
         TEST_CASE(template16);
         TEST_CASE(template_default_parameter);
+        TEST_CASE(template_default_type);
         TEST_CASE(template_typename);
 
         TEST_CASE(namespaces);
@@ -1391,6 +1392,41 @@ private:
         }
     }
 
+    void template_default_type()
+    {
+        const char code[] = "template <typename T, typename U=T>\n"
+                            "class A\n"
+                            "{\n"
+                            "public:\n"
+                            "  void foo() {\n"
+                            "    int a;\n"
+                            "    a = static_cast<U>(a);\n"
+                            "  }\n"
+                            "};\n"
+                            "\n"
+                            "template <typename T>\n"
+                            "class B\n"
+                            "{\n"
+                            "protected:\n"
+                            "  A<int> a;\n"
+                            "};\n"
+                            "\n"
+                            "class C\n"
+                            "  : public B<int>\n"
+                            "{\n"
+                            "};\n";
+
+        errout.str("");
+        Settings settings;
+        Tokenizer tokenizer(&settings, this);
+        std::istringstream istr(code);
+        tokenizer.tokenize(istr, "file1.cpp");
+        tokenizer.simplifyTokenList();
+
+        ASSERT_EQUALS("[file1.cpp:15]: (error) Internal error: failed to instantiate template. The checking continues anyway.\n", errout.str());
+        TODO_ASSERT_EQUALS("", errout.str());
+    }
+
     void template_typename()
     {
         const char code[] = "template <class T>\n"