diff --git a/src/core/hle/service/apt/apt.cpp b/src/core/hle/service/apt/apt.cpp
index fbc080d76..9d4a3c502 100644
--- a/src/core/hle/service/apt/apt.cpp
+++ b/src/core/hle/service/apt/apt.cpp
@@ -114,7 +114,7 @@ static u64 GetTitleIdForApplet(AppletId id) {
                                 return data.applet_ids[0] == id || data.applet_ids[1] == id;
                             });
 
-    ASSERT_MSG(itr != applet_titleids.end(), "Unknown applet id");
+    ASSERT_MSG(itr != applet_titleids.end(), "Unknown applet id %u", id);
 
     return itr->title_ids[CFG::GetRegionValue()];
 }