diff --git a/src/hw_ostc_parser.c b/src/hw_ostc_parser.c
index 7401bc3..48eae3d 100644
--- a/src/hw_ostc_parser.c
+++ b/src/hw_ostc_parser.c
@@ -135,7 +135,7 @@ static const hw_ostc_layout_t hw_ostc_layout_frog = {
 	43, /* salinity */
 	47, /* duration */
 	19, /* temperature */
-	34, /* firmware */
+	32, /* firmware */
 };
 
 static const hw_ostc_layout_t hw_ostc_layout_ostc3 = {