diff --git a/SourceLevelDebugPkg/Include/Guid/DebugAgentGuid.h b/SourceLevelDebugPkg/Include/Guid/DebugAgentGuid.h
index 87776a31f9..d9bf9eda51 100644
--- a/SourceLevelDebugPkg/Include/Guid/DebugAgentGuid.h
+++ b/SourceLevelDebugPkg/Include/Guid/DebugAgentGuid.h
@@ -12,7 +12,7 @@
 
 **/
 
-#ifndef __EFI_DEBUG_AGNET_GUID_H__
+#ifndef __EFI_DEBUG_AGENT_GUID_H__
 #define __EFI_DEBUG_AGENT_GUID_H__
 
 ///