diff --git a/lib/tokenize.cpp b/lib/tokenize.cpp
index 8428093cb..b85bc8670 100644
--- a/lib/tokenize.cpp
+++ b/lib/tokenize.cpp
@@ -1750,9 +1750,11 @@ namespace {
         ScopeInfo3() : parent(nullptr), type(Global), bodyStart(nullptr), bodyEnd(nullptr) {}
         ScopeInfo3(ScopeInfo3 *parent_, Type type_, const std::string &name_, const Token *bodyStart_, const Token *bodyEnd_)
             : parent(parent_), type(type_), name(name_), bodyStart(bodyStart_), bodyEnd(bodyEnd_) {
+            if (name.empty())
+                return;
             fullName = name;
             ScopeInfo3 *scope = parent;
-            while (!fullName.empty() && scope && scope->parent) {
+            while (scope && scope->parent) {
                 fullName = scope->name + " :: " + fullName;
                 scope = scope->parent;
             }
@@ -1806,9 +1808,31 @@ namespace {
             }
         }
 
+        const ScopeInfo3 * findScope(const std::string & scope) const {
+            const ScopeInfo3 * tempScope = this;
+            while (tempScope) {
+                for (const auto & child : tempScope->children) {
+                    if (child.name == scope || child.fullName == scope)
+                        return &child;
+                }
+
+                tempScope = tempScope->parent;
+            }
+            return nullptr;
+        }
+
         bool findTypeInBase(const std::string &scope) const {
+            // check in base types first
             if (baseTypes.find(scope) != baseTypes.end())
                 return true;
+            // check in base types base types
+            for (const std::string & base : baseTypes) {
+                const ScopeInfo3 * baseScope = findScope(base);
+                if (baseScope && baseScope->fullName == scope)
+                    return true;
+                if (baseScope && baseScope->findTypeInBase(scope))
+                    return true;
+            }
             return false;
         }
     };
diff --git a/test/testsimplifyusing.cpp b/test/testsimplifyusing.cpp
index a30a860cb..458ce81c9 100644
--- a/test/testsimplifyusing.cpp
+++ b/test/testsimplifyusing.cpp
@@ -79,6 +79,7 @@ private:
         TEST_CASE(simplifyUsing10008);
         TEST_CASE(simplifyUsing10054);
         TEST_CASE(simplifyUsing10136);
+        TEST_CASE(simplifyUsing10171);
     }
 
     std::string tok(const char code[], bool simplify = true, Settings::PlatformType type = Settings::Native, bool debugwarnings = true) {
@@ -984,7 +985,7 @@ private:
                                 "namespace NS3 { "
                                 "class C : public A { "
                                 "public: "
-                                "void f ( const V & ) const override ; "
+                                "void f ( const std :: vector < char > & ) const override ; "
                                 "} ; "
                                 "void C :: f ( const V & ) const { } "
                                 "} "
@@ -998,9 +999,42 @@ private:
                                 "c . f ( v ) ; "
                                 "}";
             TODO_ASSERT_EQUALS(exp, act, tok(code, true));
-            TODO_ASSERT_EQUALS("", "[test.cpp:20]: (debug) Executable scope 'f' with unknown function.\n", errout.str());
+            TODO_ASSERT_EQUALS("",
+                               "[test.cpp:18]: (debug) Executable scope 'f' with unknown function.\n"
+                               "[test.cpp:20]: (debug) Executable scope 'f' with unknown function.\n", errout.str());
         }
     }
+
+    void simplifyUsing10171() {
+        const char code[] = "namespace ns {\n"
+                            "    class A {\n"
+                            "    public:\n"
+                            "        using V = std::vector<unsigned char>;\n"
+                            "        virtual void f(const V&) const = 0;\n"
+                            "    };\n"
+                            "    class B : public A {\n"
+                            "    public:\n"
+                            "        void f(const V&) const override;\n"
+                            "    };\n"
+                            "}\n"
+                            "namespace ns {\n"
+                            "    void B::f(const std::vector<unsigned char>&) const { }\n"
+                            "}";
+        const char exp[] = "namespace ns { "
+                           "class A { "
+                           "public: "
+                           "virtual void f ( const std :: vector < unsigned char > & ) const = 0 ; "
+                           "} ; "
+                           "class B : public A { "
+                           "public: "
+                           "void f ( const std :: vector < unsigned char > & ) const override ; "
+                           "} ; "
+                           "} "
+                           "namespace ns { "
+                           "void B :: f ( const std :: vector < unsigned char > & ) const { } "
+                           "}";
+        ASSERT_EQUALS(exp, tok(code, false));
+    }
 };
 
 REGISTER_TEST(TestSimplifyUsing)