diff --git a/PrmPkg/Include/PrmDataBuffer.h b/PrmPkg/Include/PrmDataBuffer.h
index c5181f4719..3af067a8c9 100644
--- a/PrmPkg/Include/PrmDataBuffer.h
+++ b/PrmPkg/Include/PrmDataBuffer.h
@@ -12,7 +12,7 @@
 
 #include <Uefi.h>
 
-#define PRM_DATA_BUFFER_HEADER_SIGNATURE  SIGNATURE_32('P','R','M','D')
+#define PRM_DATA_BUFFER_HEADER_SIGNATURE  SIGNATURE_32('P','R','M','S')
 
 #pragma pack(push, 1)