diff --git a/src/plugins/cppeditor/cppquickfix_test.cpp b/src/plugins/cppeditor/cppquickfix_test.cpp
index 206e50d89d5..09207c1dbe6 100644
--- a/src/plugins/cppeditor/cppquickfix_test.cpp
+++ b/src/plugins/cppeditor/cppquickfix_test.cpp
@@ -5125,6 +5125,34 @@ void CppEditorPlugin::test_quickfix_ExtractFunction_data()
              "{\n"
              "    extracted();\n"
              "}\n");
+
+    QTest::newRow("class in namespace")
+        << _("namespace NS {\n"
+             "class C {\n"
+             "    void f(C &c);\n"
+             "};\n"
+             "}\n"
+             "void NS::C::f(NS::C &c)\n"
+             "{\n"
+             "    @{start}C *c = &c;@{end}\n"
+             "}\n")
+        << _("namespace NS {\n"
+             "class C {\n"
+             "    void f(C &c);\n"
+             "\n"
+             "public:\n"
+             "    void extracted(NS::C &c);\n" // TODO: Remove non-required qualification
+             "};\n"
+             "}\n"
+             "void NS::C::extracted(NS::C &c)\n"
+             "{\n"
+             "    C *c = &c;\n"
+             "}\n"
+             "\n"
+             "void NS::C::f(NS::C &c)\n"
+             "{\n"
+             "    extracted(c);\n"
+             "}\n");
 }
 
 void CppEditorPlugin::test_quickfix_ExtractFunction()
diff --git a/src/plugins/cppeditor/cppquickfixes.cpp b/src/plugins/cppeditor/cppquickfixes.cpp
index b52e7be4939..24c43d24ca2 100644
--- a/src/plugins/cppeditor/cppquickfixes.cpp
+++ b/src/plugins/cppeditor/cppquickfixes.cpp
@@ -3438,12 +3438,17 @@ public:
 
         // Write class qualification, if any.
         if (matchingClass) {
-            Class *current = matchingClass;
+            const Scope *current = matchingClass;
             QVector<const Name *> classes{matchingClass->name()};
             while (current->enclosingScope()->asClass()) {
                 current = current->enclosingScope()->asClass();
                 classes.prepend(current->name());
             }
+            while (current->enclosingScope() && current->enclosingScope()->asNamespace()) {
+                current = current->enclosingScope()->asNamespace();
+                if (current->name())
+                    classes.prepend(current->name());
+            }
             for (const Name *n : classes) {
                 const Name *name = rewriteName(n, &env, control);
                 funcDef.append(printer.prettyName(name));