diff --git a/src/apps/installer/InstallerApp.cpp b/src/apps/installer/InstallerApp.cpp
index 41581a0677..acde8d9c2c 100644
--- a/src/apps/installer/InstallerApp.cpp
+++ b/src/apps/installer/InstallerApp.cpp
@@ -71,8 +71,7 @@ InstallerApp::MessageReceived(BMessage* message)
 {
 	switch (message->what) {
 		case kMsgAgree:
-			fEULAWindow->Lock();
-			fEULAWindow->Quit();
+			fEULAWindow->PostMessage(B_QUIT_REQUESTED);
 		case kMsgNext:
 			new InstallerWindow();
 			break;