diff --git a/Source/Common/ArgumentLoader.cpp b/Source/Common/ArgumentLoader.cpp
index 7b0e80310..622e88f57 100644
--- a/Source/Common/ArgumentLoader.cpp
+++ b/Source/Common/ArgumentLoader.cpp
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: MIT
 #include "Common/ArgumentLoader.h"
 #include <FEXCore/Config/Config.h>
 #include <FEXCore/fextl/fmt.h>
diff --git a/Source/Common/ArgumentLoader.h b/Source/Common/ArgumentLoader.h
index af6ed4c15..7fd19a054 100644
--- a/Source/Common/ArgumentLoader.h
+++ b/Source/Common/ArgumentLoader.h
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: MIT
 #pragma once
 
 #include <FEXCore/Config/Config.h>
diff --git a/Source/Common/Config.cpp b/Source/Common/Config.cpp
index 31ca63b02..5d6cfed33 100644
--- a/Source/Common/Config.cpp
+++ b/Source/Common/Config.cpp
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: MIT
 #include "Common/ArgumentLoader.h"
 #include "Common/Config.h"
 
diff --git a/Source/Common/Config.h b/Source/Common/Config.h
index 11eda5c0a..5e08d1ef7 100644
--- a/Source/Common/Config.h
+++ b/Source/Common/Config.h
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: MIT
 #pragma once
 #include <FEXCore/Config/Config.h>
 #include <FEXCore/fextl/string.h>
diff --git a/Source/Common/EnvironmentLoader.cpp b/Source/Common/EnvironmentLoader.cpp
index 376af86c4..2620b9074 100644
--- a/Source/Common/EnvironmentLoader.cpp
+++ b/Source/Common/EnvironmentLoader.cpp
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: MIT
 #include <string_view>
 
 namespace FEX::EnvLoader {
diff --git a/Source/Common/EnvironmentLoader.h b/Source/Common/EnvironmentLoader.h
index fb0eab210..79b74da74 100644
--- a/Source/Common/EnvironmentLoader.h
+++ b/Source/Common/EnvironmentLoader.h
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: MIT
 #pragma once
 
 namespace FEX::EnvLoader {
diff --git a/Source/Common/FDUtils.h b/Source/Common/FDUtils.h
index 7aec93596..a4f66ff37 100644
--- a/Source/Common/FDUtils.h
+++ b/Source/Common/FDUtils.h
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: MIT
 #pragma once
 
 #include <FEXCore/Utils/Allocator.h>
diff --git a/Source/Common/FEXServerClient.cpp b/Source/Common/FEXServerClient.cpp
index d57000c9c..eed92bda5 100644
--- a/Source/Common/FEXServerClient.cpp
+++ b/Source/Common/FEXServerClient.cpp
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: MIT
 #include "Common/Config.h"
 #include "Common/FEXServerClient.h"
 
diff --git a/Source/Common/FEXServerClient.h b/Source/Common/FEXServerClient.h
index 318235bbe..9eda41a48 100644
--- a/Source/Common/FEXServerClient.h
+++ b/Source/Common/FEXServerClient.h
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: MIT
 #pragma once
 
 #include <FEXCore/Utils/LogManager.h>
diff --git a/Source/Common/FileFormatCheck.cpp b/Source/Common/FileFormatCheck.cpp
index 28504b92c..4b921efe0 100644
--- a/Source/Common/FileFormatCheck.cpp
+++ b/Source/Common/FileFormatCheck.cpp
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: MIT
 #include <FEXCore/fextl/string.h>
 
 #include <fcntl.h>
diff --git a/Source/Common/FileFormatCheck.h b/Source/Common/FileFormatCheck.h
index 8661470c4..716f69394 100644
--- a/Source/Common/FileFormatCheck.h
+++ b/Source/Common/FileFormatCheck.h
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: MIT
 #pragma once
 
 #include <FEXCore/fextl/string.h>
diff --git a/Source/Common/StringUtil.cpp b/Source/Common/StringUtil.cpp
index 16d838f88..d1ab07afd 100644
--- a/Source/Common/StringUtil.cpp
+++ b/Source/Common/StringUtil.cpp
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: MIT
 #include "Common/StringUtil.h"
 
 namespace FEX::StringUtil {
diff --git a/Source/Common/StringUtil.h b/Source/Common/StringUtil.h
index 78ec1ef01..9ff5ff23a 100644
--- a/Source/Common/StringUtil.h
+++ b/Source/Common/StringUtil.h
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: MIT
 #pragma once
 #include <FEXCore/fextl/string.h>