diff --git a/src/corelib/serialization/qdatastream.h b/src/corelib/serialization/qdatastream.h
index d03070b9195..80bd971ba34 100644
--- a/src/corelib/serialization/qdatastream.h
+++ b/src/corelib/serialization/qdatastream.h
@@ -267,7 +267,7 @@ class StreamStateSaver
 {
     Q_DISABLE_COPY_MOVE(StreamStateSaver)
 public:
-    inline StreamStateSaver(QDataStream *s) : stream(s), oldStatus(s->status())
+    explicit StreamStateSaver(QDataStream *s) : stream(s), oldStatus(s->status())
     {
         if (!stream->isDeviceTransactionStarted())
             stream->resetStatus();