diff --git a/include/toksvc/toksvc.h b/include/toksvc/toksvc.h
index b738139..9142061 100644
--- a/include/toksvc/toksvc.h
+++ b/include/toksvc/toksvc.h
@@ -80,6 +80,8 @@ enum toks_warning_level {
 	TOKS_WARNING_LEVEL_NONE,
 };
 
+struct _nt_guid;
+
 struct toks_source_version {
 	int		major;
 	int		minor;
@@ -108,7 +110,7 @@ struct toks_common_ctx {
 	uint64_t			actflags;
 	uint64_t			fmtflags;
 	int32_t				loglevel;
-	const nt_guid *			uuid;
+	const struct _nt_guid *		uuid;
 	void *				hroot;
 	const char *			sysroot;
 	const char *			logfile;