diff --git a/skeletons/GeneralizedTime.c b/skeletons/GeneralizedTime.c
index 3f1c11d..57a5a27 100644
--- a/skeletons/GeneralizedTime.c
+++ b/skeletons/GeneralizedTime.c
@@ -613,7 +613,7 @@
 	const unsigned int buf_size =
 		4 + 2 + 2	/* yyyymmdd */
 		+ 2 + 2 + 2	/* hhmmss */
-		+ 1 + 6		/* .ffffff */
+		+ 1 + 9		/* .fffffffff */
 		+ 1 + 4		/* +hhmm */
 		+ 1		/* '\0' */
 		;