diff --git a/src/plugins/diffeditor/diffeditordocument.cpp b/src/plugins/diffeditor/diffeditordocument.cpp
index 9928ef61972..aac0ba2f063 100644
--- a/src/plugins/diffeditor/diffeditordocument.cpp
+++ b/src/plugins/diffeditor/diffeditordocument.cpp
@@ -203,11 +203,19 @@ QString DiffEditorDocument::fallbackSaveAsPath() const
     return QDir::homePath();
 }
 
+bool DiffEditorDocument::isSaveAsAllowed() const
+{
+    return !isReloading();
+}
+
 bool DiffEditorDocument::save(QString *errorString, const QString &fileName, bool autoSave)
 {
     Q_UNUSED(errorString)
     Q_UNUSED(autoSave)
 
+    if (isReloading())
+        return false;
+
     const bool ok = write(fileName, format(), plainText(), errorString);
 
     if (!ok)
@@ -330,6 +338,7 @@ void DiffEditorDocument::beginReload()
 {
     emit aboutToReload();
     m_isReloading = true;
+    emit changed();
     const bool blocked = blockSignals(true);
     setDiffFiles(QList<FileData>(), QString());
     setDescription(QString());
@@ -339,6 +348,7 @@ void DiffEditorDocument::beginReload()
 void DiffEditorDocument::endReload(bool success)
 {
     m_isReloading = false;
+    emit changed();
     emit reloadFinished(success);
 }
 
diff --git a/src/plugins/diffeditor/diffeditordocument.h b/src/plugins/diffeditor/diffeditordocument.h
index c61d17ad909..18c73b61cee 100644
--- a/src/plugins/diffeditor/diffeditordocument.h
+++ b/src/plugins/diffeditor/diffeditordocument.h
@@ -70,7 +70,7 @@ public:
     QString fallbackSaveAsPath() const override;
     QString fallbackSaveAsFileName() const override;
 
-    bool isSaveAsAllowed() const override { return true; }
+    bool isSaveAsAllowed() const override;
     bool save(QString *errorString, const QString &fileName, bool autoSave) override;
     void reload();
     bool reload(QString *errorString, ReloadFlag flag, ChangeType type) override;