diff --git a/src/ext/Bal/stdbas/WixInternalUIBootstrapperApplication.cpp b/src/ext/Bal/stdbas/WixInternalUIBootstrapperApplication.cpp
index 23db7c5f9..270ce40c0 100644
--- a/src/ext/Bal/stdbas/WixInternalUIBootstrapperApplication.cpp
+++ b/src/ext/Bal/stdbas/WixInternalUIBootstrapperApplication.cpp
@@ -578,7 +578,7 @@ class CWixInternalUIBootstrapperApplication : public CBootstrapperApplicationBas
             dwWindowStyle |= WS_VISIBLE;
         }
 
-        m_hWnd = ::CreateWindowExW(WS_EX_TOOLWINDOW, wc.lpszClassName, NULL, dwWindowStyle, 0, 0, 0, 0, HWND_DESKTOP, NULL, m_hModule, this);
+        m_hWnd = ::CreateWindowExW(WS_EX_APPWINDOW, wc.lpszClassName, NULL, dwWindowStyle, 0, 0, 0, 0, HWND_DESKTOP, NULL, m_hModule, this);
         ExitOnNullWithLastError(m_hWnd, hr, "Failed to create internal UI main window.");
 
     LExit: