diff --git a/src/corelib/kernel/qmetatype.h b/src/corelib/kernel/qmetatype.h
index 83801a20c5..a2f203bf7a 100644
--- a/src/corelib/kernel/qmetatype.h
+++ b/src/corelib/kernel/qmetatype.h
@@ -889,11 +889,11 @@ struct ContainerAPI<QVector<T> > : CapabilitiesImpl<QVector<T> >
 
 template<typename T>
 struct ContainerAPI<std::vector<T> > : CapabilitiesImpl<std::vector<T> >
-{ static int size(const std::vector<T> *t) { return t->size(); } };
+{ static int size(const std::vector<T> *t) { return int(t->size()); } };
 
 template<typename T>
 struct ContainerAPI<std::list<T> > : CapabilitiesImpl<std::list<T> >
-{ static int size(const std::list<T> *t) { return t->size(); } };
+{ static int size(const std::list<T> *t) { return int(t->size()); } };
 
 class QSequentialIterableImpl
 {
diff --git a/src/corelib/tools/qhash.h b/src/corelib/tools/qhash.h
index d4bf8df442..409774a76d 100644
--- a/src/corelib/tools/qhash.h
+++ b/src/corelib/tools/qhash.h
@@ -297,7 +297,7 @@ public:
     inline QHash(std::initializer_list<std::pair<Key,T> > list)
         : d(const_cast<QHashData *>(&QHashData::shared_null))
     {
-        reserve(list.size());
+        reserve(int(list.size()));
         for (typename std::initializer_list<std::pair<Key,T> >::const_iterator it = list.begin(); it != list.end(); ++it)
             insert(it->first, it->second);
     }
@@ -973,7 +973,7 @@ public:
 #ifdef Q_COMPILER_INITIALIZER_LISTS
     inline QMultiHash(std::initializer_list<std::pair<Key,T> > list)
     {
-        this->reserve(list.size());
+        this->reserve(int(list.size()));
         for (typename std::initializer_list<std::pair<Key,T> >::const_iterator it = list.begin(); it != list.end(); ++it)
             insert(it->first, it->second);
     }
diff --git a/src/corelib/tools/qset.h b/src/corelib/tools/qset.h
index ad2f91b983..291c8fe4f9 100644
--- a/src/corelib/tools/qset.h
+++ b/src/corelib/tools/qset.h
@@ -60,7 +60,7 @@ public:
 #ifdef Q_COMPILER_INITIALIZER_LISTS
     inline QSet(std::initializer_list<T> list)
     {
-        reserve(list.size());
+        reserve(int(list.size()));
         for (typename std::initializer_list<T>::const_iterator it = list.begin(); it != list.end(); ++it)
             insert(*it);
     }