diff --git a/src/libs/3rdparty/cplusplus/Bind.cpp b/src/libs/3rdparty/cplusplus/Bind.cpp
index 4ad562eb0c6..effaac4b65a 100644
--- a/src/libs/3rdparty/cplusplus/Bind.cpp
+++ b/src/libs/3rdparty/cplusplus/Bind.cpp
@@ -276,8 +276,25 @@ FullySpecifiedType Bind::postfixDeclarator(PostfixDeclaratorAST *ast, const Full
     return value;
 }
 
-bool Bind::preVisit(AST *)
+bool Bind::preVisit(AST *ast)
 {
+    if (_typeWasUnsignedOrSigned) {
+        if (SimpleSpecifierAST *simpleAst = ast->asSimpleSpecifier()) {
+            switch (tokenKind(simpleAst->specifier_token)) {
+                case T_CHAR:
+                case T_CHAR16_T:
+                case T_CHAR32_T:
+                case T_WCHAR_T:
+                case T_INT:
+                case T_SHORT:
+                case T_LONG:
+                    _type.setType(&UndefinedType::instance);
+                    break;
+            }
+        }
+        _typeWasUnsignedOrSigned = false;
+    }
+
     ++_depth;
     if (_depth > kMaxDepth)
         return false;
@@ -2980,13 +2997,17 @@ bool Bind::visit(SimpleSpecifierAST *ast)
         case T_SIGNED:
             if (_type.isSigned())
                 translationUnit()->error(ast->specifier_token, "duplicate `%s'", spell(ast->specifier_token));
+            _type.setType(control()->integerType(IntegerType::Int));
             _type.setSigned(true);
+            _typeWasUnsignedOrSigned = true;
             break;
 
         case T_UNSIGNED:
             if (_type.isUnsigned())
                 translationUnit()->error(ast->specifier_token, "duplicate `%s'", spell(ast->specifier_token));
+            _type.setType(control()->integerType(IntegerType::Int));
             _type.setUnsigned(true);
+            _typeWasUnsignedOrSigned = true;
             break;
 
         case T_CHAR:
diff --git a/src/libs/3rdparty/cplusplus/Bind.h b/src/libs/3rdparty/cplusplus/Bind.h
index e5ee6228814..3947e57026d 100644
--- a/src/libs/3rdparty/cplusplus/Bind.h
+++ b/src/libs/3rdparty/cplusplus/Bind.h
@@ -300,6 +300,7 @@ private:
     int _methodKey;
     bool _skipFunctionBodies;
     int _depth;
+    bool _typeWasUnsignedOrSigned = false;
 };
 
 } // namespace CPlusPlus
diff --git a/src/plugins/cppeditor/cppquickfix_test.cpp b/src/plugins/cppeditor/cppquickfix_test.cpp
index 060eb808a93..bbd192f7f74 100644
--- a/src/plugins/cppeditor/cppquickfix_test.cpp
+++ b/src/plugins/cppeditor/cppquickfix_test.cpp
@@ -4713,6 +4713,95 @@ void QuickfixTest::testInsertDefFromDeclTemplateFunction()
     QuickFixOperationTest(singleDocument(original, expected), &factory);
 }
 
+void QuickfixTest::testInsertDefFromDeclFunctionWithSignedUnsignedArgument()
+{
+    QByteArray original;
+    QByteArray expected;
+    InsertDefFromDecl factory;
+
+    original =R"--(
+class myclass
+{
+    myc@lass(QVector<signed> g);
+    myclass(QVector<unsigned> g);
+}
+)--";
+    expected =R"--(
+class myclass
+{
+    myclass(QVector<signed> g);
+    myclass(QVector<unsigned> g);
+}
+
+myclass::myclass(QVector<signed int> g)
+{
+
+}
+)--";
+
+    QuickFixOperationTest(singleDocument(original, expected), &factory);
+
+    original =R"--(
+class myclass
+{
+    myclass(QVector<signed> g);
+    myc@lass(QVector<unsigned> g);
+}
+)--";
+    expected =R"--(
+class myclass
+{
+    myclass(QVector<signed> g);
+    myclass(QVector<unsigned> g);
+}
+
+myclass::myclass(QVector<unsigned int> g)
+{
+
+}
+)--";
+
+    QuickFixOperationTest(singleDocument(original, expected), &factory);
+
+    original =R"--(
+class myclass
+{
+    unsigned f@oo(unsigned);
+}
+)--";
+    expected =R"--(
+class myclass
+{
+    unsigned foo(unsigned);
+}
+
+unsigned int myclass::foo(unsigned int)
+{
+
+}
+)--";
+    QuickFixOperationTest(singleDocument(original, expected), &factory);
+
+    original =R"--(
+class myclass
+{
+    signed f@oo(signed);
+}
+)--";
+    expected =R"--(
+class myclass
+{
+    signed foo(signed);
+}
+
+signed int myclass::foo(signed int)
+{
+
+}
+)--";
+    QuickFixOperationTest(singleDocument(original, expected), &factory);
+}
+
 void QuickfixTest::testInsertDefFromDeclNotTriggeredForFriendFunc()
 {
     const QByteArray contents =
diff --git a/src/plugins/cppeditor/cppquickfix_test.h b/src/plugins/cppeditor/cppquickfix_test.h
index f381294a25e..2a72e45df55 100644
--- a/src/plugins/cppeditor/cppquickfix_test.h
+++ b/src/plugins/cppeditor/cppquickfix_test.h
@@ -133,6 +133,7 @@ private slots:
     void testInsertDefFromDeclTemplateClass();
     void testInsertDefFromDeclTemplateClassWithValueParam();
     void testInsertDefFromDeclTemplateFunction();
+    void testInsertDefFromDeclFunctionWithSignedUnsignedArgument();
     void testInsertDefFromDeclNotTriggeredForFriendFunc();
     void testInsertDefFromDeclMinimalFunctionParameterType();
     void testInsertDefFromDeclAliasTemplateAsReturnType();