diff --git a/Source/Core/Core/CoreTiming.cpp b/Source/Core/Core/CoreTiming.cpp
index f87f9a9bac..8b92f72f35 100644
--- a/Source/Core/Core/CoreTiming.cpp
+++ b/Source/Core/Core/CoreTiming.cpp
@@ -3,6 +3,7 @@
 // Refer to the license.txt file included.
 
 #include <cinttypes>
+#include <mutex>
 #include <string>
 #include <vector>
 
diff --git a/Source/Core/Core/FifoPlayer/FifoPlayer.cpp b/Source/Core/Core/FifoPlayer/FifoPlayer.cpp
index 02455f0a34..668748b5d9 100644
--- a/Source/Core/Core/FifoPlayer/FifoPlayer.cpp
+++ b/Source/Core/Core/FifoPlayer/FifoPlayer.cpp
@@ -3,6 +3,7 @@
 // Refer to the license.txt file included.
 
 #include <algorithm>
+#include <mutex>
 
 #include "Common/CommonTypes.h"
 #include "Core/ConfigManager.h"
diff --git a/Source/Core/Core/FifoPlayer/FifoRecorder.cpp b/Source/Core/Core/FifoPlayer/FifoRecorder.cpp
index 01d3d082fb..17d8e94e08 100644
--- a/Source/Core/Core/FifoPlayer/FifoRecorder.cpp
+++ b/Source/Core/Core/FifoPlayer/FifoRecorder.cpp
@@ -3,6 +3,7 @@
 // Refer to the license.txt file included.
 
 #include <algorithm>
+#include <mutex>
 
 #include "Common/Thread.h"
 #include "Core/ConfigManager.h"
diff --git a/Source/Core/Core/GeckoCode.cpp b/Source/Core/Core/GeckoCode.cpp
index c55f13f50f..1ea285d5e2 100644
--- a/Source/Core/Core/GeckoCode.cpp
+++ b/Source/Core/Core/GeckoCode.cpp
@@ -2,6 +2,7 @@
 // Licensed under GPLv2+
 // Refer to the license.txt file included.
 
+#include <mutex>
 #include <vector>
 
 #include "Common/CommonPaths.h"
diff --git a/Source/Core/Core/HW/SI_DeviceGBA.cpp b/Source/Core/Core/HW/SI_DeviceGBA.cpp
index 970ea72ad7..9850f2d0ed 100644
--- a/Source/Core/Core/HW/SI_DeviceGBA.cpp
+++ b/Source/Core/Core/HW/SI_DeviceGBA.cpp
@@ -2,6 +2,7 @@
 // Licensed under GPLv2+
 // Refer to the license.txt file included.
 
+#include <mutex>
 #include <queue>
 
 #include "Common/CommonFuncs.h"
diff --git a/Source/Core/Core/HW/SI_GCAdapter.cpp b/Source/Core/Core/HW/SI_GCAdapter.cpp
index e6b3807462..7115dc3e40 100644
--- a/Source/Core/Core/HW/SI_GCAdapter.cpp
+++ b/Source/Core/Core/HW/SI_GCAdapter.cpp
@@ -3,6 +3,7 @@
 // Refer to the license.txt file included.
 
 #include <libusb.h>
+#include <mutex>
 
 #include "Common/Flag.h"
 #include "Common/Thread.h"
diff --git a/Source/Core/Core/Movie.cpp b/Source/Core/Core/Movie.cpp
index c2a143aff8..b59ff1d78a 100644
--- a/Source/Core/Core/Movie.cpp
+++ b/Source/Core/Core/Movie.cpp
@@ -2,6 +2,7 @@
 // Licensed under GPLv2+
 // Refer to the license.txt file included.
 
+#include <mutex>
 #include <polarssl/md5.h>
 
 #include "Common/ChunkFile.h"
diff --git a/Source/Core/VideoBackends/Software/SWRenderer.cpp b/Source/Core/VideoBackends/Software/SWRenderer.cpp
index 7d27b31389..761cc667df 100644
--- a/Source/Core/VideoBackends/Software/SWRenderer.cpp
+++ b/Source/Core/VideoBackends/Software/SWRenderer.cpp
@@ -4,6 +4,7 @@
 
 #include <algorithm>
 #include <atomic>
+#include <mutex>
 #include <string>
 
 #include "Common/CommonTypes.h"