diff --git a/Source/Core/Core/Debugger/Debugger_SymbolMap.cpp b/Source/Core/Core/Debugger/Debugger_SymbolMap.cpp
index 9d155e6cdc..59fae90e70 100644
--- a/Source/Core/Core/Debugger/Debugger_SymbolMap.cpp
+++ b/Source/Core/Core/Debugger/Debugger_SymbolMap.cpp
@@ -2,6 +2,8 @@
 // Licensed under GPLv2
 // Refer to the license.txt file included.
 
+#include <functional>
+
 #include "Common/Common.h"
 #include "Common/StringUtil.h"