diff --git a/src/corelib/tools/qarraydataops.h b/src/corelib/tools/qarraydataops.h
index c2414f22f2..a0c3da7cce 100644
--- a/src/corelib/tools/qarraydataops.h
+++ b/src/corelib/tools/qarraydataops.h
@@ -1373,18 +1373,32 @@ public:
     template <typename ...Args>
     void emplaceBack(Args&&... args)
     {
-        Q_ASSERT(!this->isShared());
-        Q_ASSERT(this->freeSpaceAtEnd() >= 1);
-        new (this->end()) T(std::forward<Args>(args)...);
+        if (this->needsDetach() || !this->freeSpaceAtEnd()) {
+            // protect against args being an element of the container
+            T tmp(std::forward<Args>(args)...);
+            this->reallocateAndGrow(QArrayData::GrowsAtEnd, 1);
+            Q_ASSERT(!this->isShared());
+            Q_ASSERT(this->freeSpaceAtEnd() >= 1);
+            new (this->end()) T(std::move(tmp));
+        } else {
+            new (this->end()) T(std::forward<Args>(args)...);
+        }
         ++this->size;
     }
 
     template <typename ...Args>
     void emplaceFront(Args&&... args)
     {
-        Q_ASSERT(!this->isShared());
-        Q_ASSERT(this->freeSpaceAtBegin() >= 1);
-        new (this->ptr - 1) T(std::forward<Args>(args)...);
+        if (this->needsDetach() || !this->freeSpaceAtBegin()) {
+            // protect against args being an element of the container
+            T tmp(std::forward<Args>(args)...);
+            this->reallocateAndGrow(QArrayData::GrowsAtBeginning, 1);
+            Q_ASSERT(!this->isShared());
+            Q_ASSERT(this->freeSpaceAtBegin() >= 1);
+            new (this->ptr - 1) T(std::move(tmp));
+        } else {
+            new (this->ptr - 1) T(std::forward<Args>(args)...);
+        }
         --this->ptr;
         ++this->size;
     }
diff --git a/src/corelib/tools/qlist.h b/src/corelib/tools/qlist.h
index 9c95d49bae..eefe7b448f 100644
--- a/src/corelib/tools/qlist.h
+++ b/src/corelib/tools/qlist.h
@@ -715,14 +715,7 @@ template<typename T>
 template<typename... Args>
 inline typename QList<T>::reference QList<T>::emplaceFront(Args &&... args)
 {
-    if (d->needsDetach() || !d.freeSpaceAtBegin()) {
-        // protect against args being an element of the container
-        T tmp(std::forward<Args>(args)...);
-        d.reallocateAndGrow(QArrayData::GrowsAtBeginning, 1);
-        d->emplaceFront(std::move(tmp));
-    } else {
-        d->emplaceFront(std::forward<Args>(args)...);
-    }
+    d->emplaceFront(std::forward<Args>(args)...);
     return *d.begin();
 }
 
@@ -751,14 +744,7 @@ template<typename T>
 template<typename... Args>
 inline typename QList<T>::reference QList<T>::emplaceBack(Args &&... args)
 {
-    if (d->needsDetach() || !d.freeSpaceAtEnd()) {
-        // protect against args being an element of the container
-        T tmp(std::forward<Args>(args)...);
-        d.reallocateAndGrow(QArrayData::GrowsAtEnd, 1);
-        d->emplaceBack(std::move(tmp));
-    } else {
-        d->emplaceBack(std::forward<Args>(args)...);
-    }
+    d->emplaceBack(std::forward<Args>(args)...);
     return *(d.end() - 1);
 }