diff --git a/SecurityPkg/Test/Mock/Include/GoogleTest/Ppi/MockTcgPpi.h b/SecurityPkg/Test/Mock/Include/GoogleTest/Ppi/MockTcgPpi.h
index 1e128a254b..252b2e7308 100644
--- a/SecurityPkg/Test/Mock/Include/GoogleTest/Ppi/MockTcgPpi.h
+++ b/SecurityPkg/Test/Mock/Include/GoogleTest/Ppi/MockTcgPpi.h
@@ -7,7 +7,7 @@
 
 #ifndef MOCK_TCG_PPI_H__
 
-#define __MOCK_TCG_PPI_H__
+#define MOCK_TCG_PPI_H__
 
 #include <Library/GoogleTestLib.h>
 #include <Library/FunctionMockLib.h>