diff --git a/tests/auto/utils/qtcprocess/tst_qtcprocess.cpp b/tests/auto/utils/qtcprocess/tst_qtcprocess.cpp
index 2fbdedb1122..f8422c053d4 100644
--- a/tests/auto/utils/qtcprocess/tst_qtcprocess.cpp
+++ b/tests/auto/utils/qtcprocess/tst_qtcprocess.cpp
@@ -1011,8 +1011,13 @@ void tst_QtcProcess::lineCallback()
     QStringList lines = QString(lineCallbackData).split('|');
     int lineNumber = 0;
     process.setStdErrLineCallback([lines, &lineNumber](const QString &actual) {
-        QString expected = lines.at(lineNumber++);
+        QString expected = lines.at(lineNumber);
         expected.replace("\r\n", "\n");
+        // Omit some initial lines generated by Qt, e.g.
+        // Warning: Ignoring WAYLAND_DISPLAY on Gnome. Use QT_QPA_PLATFORM=wayland to run on Wayland anyway.
+        if (lineNumber == 0 && actual != expected)
+            return;
+        ++lineNumber;
         QCOMPARE(actual, expected);
     });
     process.start();
@@ -1026,8 +1031,13 @@ void tst_QtcProcess::lineCallbackIntern()
     QStringList lines = QString(lineCallbackData).split('|');
     int lineNumber = 0;
     process.setStdOutLineCallback([lines, &lineNumber](const QString &actual) {
-        QString expected = lines.at(lineNumber++);
+        QString expected = lines.at(lineNumber);
         expected.replace("\r\n", "\n");
+        // Omit some initial lines generated by Qt, e.g.
+        // Warning: Ignoring WAYLAND_DISPLAY on Gnome. Use QT_QPA_PLATFORM=wayland to run on Wayland anyway.
+        if (lineNumber == 0 && actual != expected)
+            return;
+        ++lineNumber;
         QCOMPARE(actual, expected);
     });
     process.beginFeed();