diff --git a/pcsx2/DebugTools/SymbolGuardian.h b/pcsx2/DebugTools/SymbolGuardian.h
index 67bfd129c76a9..eb93c1a6b8ce5 100644
--- a/pcsx2/DebugTools/SymbolGuardian.h
+++ b/pcsx2/DebugTools/SymbolGuardian.h
@@ -6,6 +6,7 @@
 #include <atomic>
 #include <thread>
 #include <functional>
+#include <mutex>
 #include <shared_mutex>
 
 #include <ccc/ast.h>