diff --git a/src/corelib/io/qstorageinfo_linux.cpp b/src/corelib/io/qstorageinfo_linux.cpp
index 40e3cafd5a6..7475f3d4166 100644
--- a/src/corelib/io/qstorageinfo_linux.cpp
+++ b/src/corelib/io/qstorageinfo_linux.cpp
@@ -170,7 +170,7 @@ void QStorageInfoPrivate::retrieveVolumeInfo()
         bytesTotal = statfs_buf.f_blocks * statfs_buf.f_frsize;
         bytesFree = statfs_buf.f_bfree * statfs_buf.f_frsize;
         bytesAvailable = statfs_buf.f_bavail * statfs_buf.f_frsize;
-        blockSize = statfs_buf.f_bsize;
+        blockSize = int(statfs_buf.f_bsize);
 
 #if defined(Q_OS_ANDROID)
 #if defined(_STATFS_F_FLAGS)
diff --git a/src/corelib/io/qstorageinfo_p.h b/src/corelib/io/qstorageinfo_p.h
index e133c20cb49..25106dacfbb 100644
--- a/src/corelib/io/qstorageinfo_p.h
+++ b/src/corelib/io/qstorageinfo_p.h
@@ -96,7 +96,7 @@ public:
     qint64 bytesTotal = -1;
     qint64 bytesFree = -1;
     qint64 bytesAvailable = -1;
-    ulong blockSize = ulong(-1);
+    int blockSize = -1;
 
     bool readOnly = false;
     bool ready = false;
diff --git a/src/corelib/io/qstorageinfo_unix.cpp b/src/corelib/io/qstorageinfo_unix.cpp
index 75d83a58d65..3c458ad30b9 100644
--- a/src/corelib/io/qstorageinfo_unix.cpp
+++ b/src/corelib/io/qstorageinfo_unix.cpp
@@ -417,7 +417,7 @@ void QStorageInfoPrivate::retrieveVolumeInfo()
         bytesFree = statfs_buf.f_bfree * statfs_buf.f_frsize;
         bytesAvailable = statfs_buf.f_bavail * statfs_buf.f_frsize;
 #endif
-        blockSize = statfs_buf.f_bsize;
+        blockSize = int(statfs_buf.f_bsize);
 #if defined(Q_OS_ANDROID) || defined(Q_OS_BSD4) || defined(Q_OS_INTEGRITY) || defined(Q_OS_RTEMS)
 #if defined(_STATFS_F_FLAGS)
         readOnly = (statfs_buf.f_flags & ST_RDONLY) != 0;
diff --git a/src/corelib/io/qstorageinfo_win.cpp b/src/corelib/io/qstorageinfo_win.cpp
index 0d2d34898cf..3ee1df9f3c8 100644
--- a/src/corelib/io/qstorageinfo_win.cpp
+++ b/src/corelib/io/qstorageinfo_win.cpp
@@ -203,7 +203,7 @@ bool QStorageInfoPrivate::queryStorageProperty()
                                   nullptr);
     CloseHandle(handle);
     if (result)
-        blockSize = saad.BytesPerPhysicalSector;
+        blockSize = int(saad.BytesPerPhysicalSector);
     return result;
 }