diff --git a/src/qteletextmaker/loadformats.cpp b/src/qteletextmaker/loadformats.cpp
index 40e97b6..c7ffda6 100644
--- a/src/qteletextmaker/loadformats.cpp
+++ b/src/qteletextmaker/loadformats.cpp
@@ -206,6 +206,7 @@ bool LoadT42Format::load(QFile *inFile, TeletextDocument *document)
 
 	m_warnings.clear();
 	m_error.clear();
+	m_reExportWarning = false;
 
 	for (;;) {
 		if (!readPacket())
@@ -247,6 +248,7 @@ bool LoadT42Format::load(QFile *inFile, TeletextDocument *document)
 				if (readPageNumber != foundPageNumber) {
 					// More than one page in .t42 file - end of current page reached
 					m_warnings.append("More than one page in .t42 file, only first full page loaded.");
+					m_reExportWarning = true;
 					break;
 				}
 				// Could get here if X/0 with same page number was found with no body packets inbetween
@@ -421,6 +423,7 @@ bool LoadEP1Format::load(QFile *inFile, TeletextDocument *document)
 {
 	m_warnings.clear();
 	m_error.clear();
+	m_reExportWarning = false;
 
 	unsigned char inLine[42];
 	unsigned char numOfSubPages = 1;
@@ -440,6 +443,7 @@ bool LoadEP1Format::load(QFile *inFile, TeletextDocument *document)
 				return false;
 
 			m_warnings.append("More than one page in EP1/EPX file, only first full page loaded.");
+			m_reExportWarning = true;
 		}
 
 		// Check for header of a (sub)page
diff --git a/src/qteletextmaker/loadformats.h b/src/qteletextmaker/loadformats.h
index 4ebe3e6..318db04 100644
--- a/src/qteletextmaker/loadformats.h
+++ b/src/qteletextmaker/loadformats.h
@@ -43,11 +43,13 @@ public:
 	QString fileDialogFilter() const { return QString(description() + " (*." + extensions().join(" *.") + ')'); };
 	QStringList warningStrings() const { return m_warnings; };
 	QString errorString() const { return m_error; };
+	bool reExportWarning() const { return m_reExportWarning; };
 
 protected:
 	TeletextDocument const *m_document;
 	QStringList m_warnings;
 	QString m_error;
+	bool m_reExportWarning = false;
 };
 
 class LoadTTIFormat : public LoadFormat
diff --git a/src/qteletextmaker/mainwindow.cpp b/src/qteletextmaker/mainwindow.cpp
index 7084433..bf494e1 100644
--- a/src/qteletextmaker/mainwindow.cpp
+++ b/src/qteletextmaker/mainwindow.cpp
@@ -332,6 +332,7 @@ void MainWindow::init()
 	setAttribute(Qt::WA_DeleteOnClose);
 
 	m_isUntitled = true;
+	m_reExportWarning = false;
 
 	m_textWidget = new TeletextWidget;
 
@@ -1087,6 +1088,8 @@ void MainWindow::loadFile(const QString &fileName)
 	if (!loadingFormat->warningStrings().isEmpty())
 		QMessageBox::warning(this, QApplication::applicationDisplayName(), tr("The following issues were encountered when loading<br>%1:<ul><li>%2</li></ul>").arg(QDir::toNativeSeparators(fileName), loadingFormat->warningStrings().join("</li><li>")));
 
+	m_reExportWarning = loadingFormat->reExportWarning();
+
 	setCurrentFile(fileName);
 	statusBar()->showMessage(tr("File loaded"), 2000);
 }
@@ -1228,9 +1231,14 @@ void MainWindow::exportFile(bool fromAuto)
 	QString exportFileName;
 	SaveFormat *exportFormat = nullptr;
 
-	if (fromAuto)
+	if (fromAuto) {
+		if (m_reExportWarning) {
+			QMessageBox::StandardButton ret = QMessageBox::warning(this, QApplication::applicationDisplayName(), tr("Will not overwrite imported file %1:\nAll other subpages in that file would be erased.\nPlease save or export to a different file.").arg(strippedName(m_exportAutoFileName)));
+
+			return;
+		}
 		exportFileName = m_exportAutoFileName;
-	else {
+	} else {
 		if (m_exportAutoFileName.isEmpty())
 			exportFileName = m_curFile;
 		else
@@ -1284,6 +1292,7 @@ void MainWindow::exportFile(bool fromAuto)
 	MainWindow::prependToRecentFiles(exportFileName);
 
 	m_exportAutoFileName = exportFileName;
+	m_reExportWarning = false;
 	statusBar()->showMessage(tr("File exported"), 2000);
 }
 
diff --git a/src/qteletextmaker/mainwindow.h b/src/qteletextmaker/mainwindow.h
index 44c65e2..7325647 100644
--- a/src/qteletextmaker/mainwindow.h
+++ b/src/qteletextmaker/mainwindow.h
@@ -139,7 +139,7 @@ private:
 	QRadioButton *m_levelRadioButton[4];
 
 	QString m_curFile, m_exportAutoFileName, m_exportImageFileName;
-	bool m_isUntitled;
+	bool m_isUntitled, m_reExportWarning;
 
 	LoadFormats m_loadFormats;
 	SaveFormats m_saveFormats;