diff --git a/src/template.c b/src/template.c
index 9494f72..d4e00e7 100644
--- a/src/template.c
+++ b/src/template.c
@@ -169,7 +169,8 @@ main(void)
 			4 * 4   /* 4 strings of 4 characters */ +
 			5 * 4   /* 4 uint32_t values */         +
 			4 * 2   /* 5 uint16_t values */         +
-			PRODUCT /* sample data */,
+			PRODUCT /* sample data */
+			- 8,
 		fmt_data_length = 16 /* <--
 		 * length of format data before this value
 		 * in the file format structure