diff --git a/src/debug/HyprCtl.cpp b/src/debug/HyprCtl.cpp
index 1b6b07b2..63037069 100644
--- a/src/debug/HyprCtl.cpp
+++ b/src/debug/HyprCtl.cpp
@@ -133,7 +133,7 @@ R"#({
     "monitor": "%s",
     "windows": %i,
     "hasfullscreen": %s,
-    "lastwindow": %x,
+    "lastwindow": "%x",
     "lastwindowtitle": "%s"
 },)#",
                 w->m_iID,