diff --git a/include/efi_api.h b/include/efi_api.h
index d7d95edd4df..4de5d208f59 100644
--- a/include/efi_api.h
+++ b/include/efi_api.h
@@ -577,7 +577,9 @@ struct simple_text_output_mode {
 #define EFI_ATTR_BG(attr)        (((attr) >> 4) & 0x7)
 
 struct efi_simple_text_output_protocol {
-	void *reset;
+	efi_status_t (EFIAPI *reset)(
+			struct efi_simple_text_output_protocol *this,
+			char extended_verification);
 	efi_status_t (EFIAPI *output_string)(
 			struct efi_simple_text_output_protocol *this,
 			const efi_string_t str);