diff --git a/src/corelib/io/qdataurl.cpp b/src/corelib/io/qdataurl.cpp
index 2d2426e8ea5..208a432e7a6 100644
--- a/src/corelib/io/qdataurl.cpp
+++ b/src/corelib/io/qdataurl.cpp
@@ -56,9 +56,10 @@ Q_CORE_EXPORT bool qDecodeDataUrl(const QUrl &uri, QString &mimeType, QByteArray
             mimeType = textPlain + QLatin1StringView(data.trimmed());
         else
             mimeType = QStringLiteral("text/plain;charset=US-ASCII");
+        return true;
     }
 
-    return true;
+    return false;
 }
 
 QT_END_NAMESPACE
diff --git a/tests/auto/corelib/io/qdataurl/tst_qdataurl.cpp b/tests/auto/corelib/io/qdataurl/tst_qdataurl.cpp
index 39d860adaf7..9c2276d99fa 100644
--- a/tests/auto/corelib/io/qdataurl/tst_qdataurl.cpp
+++ b/tests/auto/corelib/io/qdataurl/tst_qdataurl.cpp
@@ -31,7 +31,7 @@ void tst_QDataUrl::decode_data()
     row("malformed-host", "data://test.com", false);
     row("malformed-host2", "data://text/plain;charset=ISO-8859-1", false);
     row("malformed-host3", "data://test.com/,", false);
-    row("emptyData", "data:text/plain", true);
+    row("malformed-no-comma", "data:text/plain", false);
     row("emptyData-default-mimetype", "data:,", true,
         "text/plain;charset=US-ASCII"_L1, "");
     row("emptyData-only-charset", "data:charset=ISO-8859-1,", true,