diff --git a/imgui.cpp b/imgui.cpp
index 75c0183..4761a54 100644
--- a/imgui.cpp
+++ b/imgui.cpp
@@ -3720,9 +3720,9 @@
 
     char title[256];
     if (name)
-        ImFormatString(title, IM_ARRAYSIZE(title), "%s.%s.%08X", parent_window->Name, name, id);
+        ImFormatString(title, IM_ARRAYSIZE(title), "%s/%s_%08X", parent_window->Name, name, id);
     else
-        ImFormatString(title, IM_ARRAYSIZE(title), "%s.%08X", parent_window->Name, id);
+        ImFormatString(title, IM_ARRAYSIZE(title), "%s/%08X", parent_window->Name, id);
 
     bool ret = ImGui::Begin(title, NULL, size, -1.0f, flags);
     ImGuiWindow* child_window = ImGui::GetCurrentWindow();