1 files changed, 4 insertions, 0 deletions
diff --git a/ShellPkg/Include/ShellBase.h b/ShellPkg/Include/ShellBase.h
index 0005be0cae..3929df7b77 100644
--- a/ShellPkg/Include/ShellBase.h
+++ b/ShellPkg/Include/ShellBase.h
@@ -12,6 +12,9 @@ WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
 
 **/
 
+#if !defined(__SHELL_BASE__)
+#define __SHELL_BASE__
+
 typedef enum {
 ///
 /// The operation completed successfully.
@@ -140,3 +143,4 @@ SHELL_SECURITY_VIOLATION    = 26,
 SHELL_CRC_ERROR             = 27
 }SHELL_STATUS;
 
+#endif //__SHELL_BASE__
+\ No newline at end of file