diff --git a/lib/valueflow.cpp b/lib/valueflow.cpp
index ffcca8394..93846ae7a 100644
--- a/lib/valueflow.cpp
+++ b/lib/valueflow.cpp
@@ -3068,7 +3068,7 @@ static bool isLifetimeBorrowed(const ValueType *vt, const ValueType *vtParent)
         return false;
     if (!vt)
         return false;
-    if (vt->type != ValueType::UNKNOWN_TYPE && vtParent->type != ValueType::UNKNOWN_TYPE) {
+    if (vt->type != ValueType::UNKNOWN_TYPE && vtParent->type != ValueType::UNKNOWN_TYPE && vtParent->container == vt->container) {
         if (vtParent->pointer > vt->pointer)
             return true;
         if (vtParent->pointer < vt->pointer && vtParent->isIntegral())
diff --git a/test/testautovariables.cpp b/test/testautovariables.cpp
index 18ababc8d..34bb9c0be 100644
--- a/test/testautovariables.cpp
+++ b/test/testautovariables.cpp
@@ -2328,6 +2328,16 @@ private:
               "    return value;\n"
               "}\n");
         ASSERT_EQUALS("", errout.str());
+
+        // #9770
+        check("class C {\n"
+              "  std::string f(const char*);\n"
+              "};\n"
+              "std::string C::f(const char*) {\n"
+              "  const char data[] = \"x\";\n"
+              "  return data;\n"
+              "}\n");
+        ASSERT_EQUALS("", errout.str());
     }
 
     void danglingLifetimeFunction() {