diff --git a/src/Application/Application_MassViewer_Armour.cpp b/src/Application/Application_MassViewer_Armour.cpp
index a6e5b3b..f3cfb0c 100644
--- a/src/Application/Application_MassViewer_Armour.cpp
+++ b/src/Application/Application_MassViewer_Armour.cpp
@@ -86,7 +86,7 @@ Application::drawArmour() {
             ImGui::Text("Set name: %s", GameData::armour_sets.at(part.id).name.data());
         }
         else {
-            ImGui::Text("Set ID: %u", part.id);
+            ImGui::Text("Set ID: %d", part.id);
         }
 
         ImGui::SameLine();