diff --git a/src/core/io/qtextstream.cpp b/src/core/io/qtextstream.cpp
index c2cc9ca92..538198f9d 100644
--- a/src/core/io/qtextstream.cpp
+++ b/src/core/io/qtextstream.cpp
@@ -467,7 +467,6 @@ static void copyConverterStateHelper(QTextCodec::ConverterState *dest,
 {
     // ### QTextCodec::ConverterState's copy constructors and assignments are
     // private. This function copies the structure manually.
-    Q_ASSERT(!src->d);
     dest->flags = src->flags;
     dest->invalidChars = src->invalidChars;
     dest->state_data[0] = src->state_data[0];