diff --git a/imgui.cpp b/imgui.cpp
index bc86d29a..83026cfb 100644
--- a/imgui.cpp
+++ b/imgui.cpp
@@ -3574,7 +3574,7 @@ bool ImGui::Begin(const char* name, bool* p_opened, const ImVec2& size_on_first_
         }
 
         // Minimum window size
-        if (!(flags & (ImGuiWindowFlags_ChildWindow | ImGuiWindowFlags_ChildMenu | ImGuiWindowFlags_Tooltip)))
+        if (!(flags & (ImGuiWindowFlags_ChildWindow | ImGuiWindowFlags_Popup | ImGuiWindowFlags_ChildMenu | ImGuiWindowFlags_Tooltip)))
         {
             window->SizeFull = ImMax(window->SizeFull, style.WindowMinSize);
             if (!window->Collapsed)