diff --git a/gnss-converters.cabal b/gnss-converters.cabal
--- a/gnss-converters.cabal
+++ b/gnss-converters.cabal
@@ -1,6 +1,6 @@
 cabal-version: >=1.22
 name: gnss-converters
-version: 0.3.38
+version: 0.3.39
 license: BSD3
 copyright: Copyright (C) 2016, 2017 Swift Navigation, Inc.
 maintainer: Swift Navigation <dev@swiftnav.com>
diff --git a/src/Data/RTCM3/SBP/MSM.hs b/src/Data/RTCM3/SBP/MSM.hs
--- a/src/Data/RTCM3/SBP/MSM.hs
+++ b/src/Data/RTCM3/SBP/MSM.hs
@@ -58,7 +58,7 @@
   | sig == 9  = Just 6
   | sig == 15 = Just 1
   | sig == 16 = Just 7
-  | sig == 17 = Just 8
+  -- | sig == 17 = Just 8
   -- | sig == 22 = Just 9
   -- | sig == 23 = Just 10
   -- | sig == 24 = Just 11