diff --git a/include/efi_api.h b/include/efi_api.h
index 8f5ef5f680f..c2d69644679 100644
--- a/include/efi_api.h
+++ b/include/efi_api.h
@@ -192,7 +192,7 @@ struct efi_boot_services {
 					struct efi_event *event,
 					void *context),
 				void *notify_context,
-				efi_guid_t *event_group,
+				const efi_guid_t *event_group,
 				struct efi_event **event);
 };
 
diff --git a/include/efi_loader.h b/include/efi_loader.h
index 247be060e1c..1fd7b0b73c9 100644
--- a/include/efi_loader.h
+++ b/include/efi_loader.h
@@ -684,7 +684,7 @@ efi_status_t efi_create_event(uint32_t type, efi_uintn_t notify_tpl,
 			      void (EFIAPI *notify_function) (
 					struct efi_event *event,
 					void *context),
-			      void *notify_context, efi_guid_t *group,
+			      void *notify_context, const efi_guid_t *group,
 			      struct efi_event **event);
 /* Call this to set a timer */
 efi_status_t efi_set_timer(struct efi_event *event, enum efi_timer_delay type,
diff --git a/lib/efi_loader/efi_boottime.c b/lib/efi_loader/efi_boottime.c
index 0b7579cb5af..f9b10a9763b 100644
--- a/lib/efi_loader/efi_boottime.c
+++ b/lib/efi_loader/efi_boottime.c
@@ -712,7 +712,7 @@ efi_status_t efi_create_event(uint32_t type, efi_uintn_t notify_tpl,
 			      void (EFIAPI *notify_function) (
 					struct efi_event *event,
 					void *context),
-			      void *notify_context, efi_guid_t *group,
+			      void *notify_context, const efi_guid_t *group,
 			      struct efi_event **event)
 {
 	struct efi_event *evt;
@@ -790,7 +790,7 @@ efi_status_t EFIAPI efi_create_event_ex(uint32_t type, efi_uintn_t notify_tpl,
 							struct efi_event *event,
 							void *context),
 					void *notify_context,
-					efi_guid_t *event_group,
+					const efi_guid_t *event_group,
 					struct efi_event **event)
 {
 	efi_status_t ret;