diff --git a/src/corelib/kernel/qobject.cpp b/src/corelib/kernel/qobject.cpp
index aef644a0ec7..33361af0f0c 100644
--- a/src/corelib/kernel/qobject.cpp
+++ b/src/corelib/kernel/qobject.cpp
@@ -1738,8 +1738,8 @@ void QObjectPrivate::setThreadData_helper(QThreadData *currentData, QThreadData
     }
 
     // move posted events
-    int eventsMoved = 0;
-    for (int i = 0; i < currentData->postEventList.size(); ++i) {
+    qsizetype eventsMoved = 0;
+    for (qsizetype i = 0; i < currentData->postEventList.size(); ++i) {
         const QPostEvent &pe = currentData->postEventList.at(i);
         if (!pe.event)
             continue;
diff --git a/src/corelib/thread/qthread.cpp b/src/corelib/thread/qthread.cpp
index 005666a7426..5e37739a1eb 100644
--- a/src/corelib/thread/qthread.cpp
+++ b/src/corelib/thread/qthread.cpp
@@ -82,7 +82,7 @@ QThreadData::~QThreadData()
     thread.storeRelease(nullptr);
     delete t;
 
-    for (int i = 0; i < postEventList.size(); ++i) {
+    for (qsizetype i = 0; i < postEventList.size(); ++i) {
         const QPostEvent &pe = postEventList.at(i);
         if (pe.event) {
             --pe.receiver->d_func()->postedEvents;