diff --git a/lib/tokenize.cpp b/lib/tokenize.cpp
index 60a4d79ac..bf576d943 100644
--- a/lib/tokenize.cpp
+++ b/lib/tokenize.cpp
@@ -407,6 +407,10 @@ bool Tokenizer::duplicateTypedef(Token **tokPtr, const Token *name)
         }
         else if (end->str() == ",")
         {
+            // check for derived class
+            if (Token::Match(tok->previous(), "public|private|protected"))
+                return false;
+
             // find end of definition
             int level = 0;
             while (end && end->next() && (!Token::Match(end->next(), ";|)|>") ||
@@ -439,7 +443,7 @@ bool Tokenizer::duplicateTypedef(Token **tokPtr, const Token *name)
             {
                 // look backwards
                 if (Token::Match(tok->previous(), "%type%") &&
-                    !Token::Match(tok->previous(), "return|new|const"))
+                    !Token::Match(tok->previous(), "return|new|const|volatile"))
                 {
                     // duplicate definition so skip entire template
                     while (end && end->str() != "{")
diff --git a/test/testsimplifytokens.cpp b/test/testsimplifytokens.cpp
index 207656130..9961eecd9 100644
--- a/test/testsimplifytokens.cpp
+++ b/test/testsimplifytokens.cpp
@@ -174,6 +174,8 @@ private:
         TEST_CASE(simplifyTypedef35);
         TEST_CASE(simplifyTypedef36); // ticket #1434
         TEST_CASE(simplifyTypedef37); // ticket #1449
+        TEST_CASE(simplifyTypedef38);
+        TEST_CASE(simplifyTypedef39);
         TEST_CASE(reverseArraySyntax)
         TEST_CASE(simplify_numeric_condition)
 
@@ -3394,6 +3396,28 @@ private:
         }
     }
 
+    void simplifyTypedef38()
+    {
+        const char code[] = "typedef C A;\n"
+                            "struct AB : public A, public B { };";
+        const char expected[] = "; struct AB : public C , public B { } ;";
+        ASSERT_EQUALS(expected, tok(code, false));
+
+        checkSimplifyTypedef(code);
+        ASSERT_EQUALS("", errout.str());
+    }
+
+    void simplifyTypedef39()
+    {
+        const char code[] = "typedef int A;\n"
+                            "template <const A, volatile A>::value;";
+        const char expected[] = "; ;";
+        ASSERT_EQUALS(expected, tok(code, false));
+
+        checkSimplifyTypedef(code);
+        ASSERT_EQUALS("", errout.str());
+    }
+
     void reverseArraySyntax()
     {
         ASSERT_EQUALS("a [ 13 ]", tok("13[a]"));