diff --git a/FEXHeaderUtils/FEXHeaderUtils/Filesystem.h b/FEXHeaderUtils/FEXHeaderUtils/Filesystem.h
index 1b4002483..26a0e1f31 100644
--- a/FEXHeaderUtils/FEXHeaderUtils/Filesystem.h
+++ b/FEXHeaderUtils/FEXHeaderUtils/Filesystem.h
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: MIT
 #pragma once
 #include <FEXCore/fextl/fmt.h>
 #include <FEXCore/fextl/list.h>
diff --git a/FEXHeaderUtils/FEXHeaderUtils/ScopedSignalMask.h b/FEXHeaderUtils/FEXHeaderUtils/ScopedSignalMask.h
index e7e97572a..a03045b98 100644
--- a/FEXHeaderUtils/FEXHeaderUtils/ScopedSignalMask.h
+++ b/FEXHeaderUtils/FEXHeaderUtils/ScopedSignalMask.h
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: MIT
 #pragma once
 
 #include <FEXCore/Utils/DeferredSignalMutex.h>
diff --git a/FEXHeaderUtils/FEXHeaderUtils/SymlinkChecks.h b/FEXHeaderUtils/FEXHeaderUtils/SymlinkChecks.h
index f1dcf2d4e..ad9a02b1d 100644
--- a/FEXHeaderUtils/FEXHeaderUtils/SymlinkChecks.h
+++ b/FEXHeaderUtils/FEXHeaderUtils/SymlinkChecks.h
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: MIT
 #pragma once
 #include <FEXCore/fextl/string.h>
 
diff --git a/FEXHeaderUtils/FEXHeaderUtils/Syscalls.h b/FEXHeaderUtils/FEXHeaderUtils/Syscalls.h
index e47032188..fdf630e2b 100644
--- a/FEXHeaderUtils/FEXHeaderUtils/Syscalls.h
+++ b/FEXHeaderUtils/FEXHeaderUtils/Syscalls.h
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: MIT
 #pragma once
 
 #include <FEXCore/Utils/LogManager.h>
diff --git a/FEXHeaderUtils/FEXHeaderUtils/TodoDefines.h b/FEXHeaderUtils/FEXHeaderUtils/TodoDefines.h
index 978e9a8a5..2072db79f 100644
--- a/FEXHeaderUtils/FEXHeaderUtils/TodoDefines.h
+++ b/FEXHeaderUtils/FEXHeaderUtils/TodoDefines.h
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: MIT
 #pragma once
 
 #ifndef DO_PRAGMA
diff --git a/FEXHeaderUtils/FEXHeaderUtils/TypeDefines.h b/FEXHeaderUtils/FEXHeaderUtils/TypeDefines.h
index 8d75d4b0e..f19fb99e7 100644
--- a/FEXHeaderUtils/FEXHeaderUtils/TypeDefines.h
+++ b/FEXHeaderUtils/FEXHeaderUtils/TypeDefines.h
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: MIT
 #pragma once
 #include <cstddef>