diff --git a/src/gui/gui.cpp b/src/gui/gui.cpp
index 11c9305b..54777589 100644
--- a/src/gui/gui.cpp
+++ b/src/gui/gui.cpp
@@ -4026,6 +4026,7 @@ void FurnaceGUI::drawDebug() {
   static int bpTick;
   static bool bpOn;
   if (!debugOpen) return;
+  ImGui::SetNextWindowSizeConstraints(ImVec2(400.0f*dpiScale,200.0f*dpiScale),ImVec2(scrW*dpiScale,scrH*dpiScale));
   if (ImGui::Begin("Debug",&debugOpen,ImGuiWindowFlags_NoDocking)) {
     ImGui::Text("NOTE: use with caution.");
     if (ImGui::TreeNode("Debug Controls")) {