diff --git a/scripts/0-rds2_oda.lua b/scripts/0-rds2_oda.lua
index abe08bc..0b23b5a 100644
--- a/scripts/0-rds2_oda.lua
+++ b/scripts/0-rds2_oda.lua
@@ -77,7 +77,7 @@ function rds2_group(stream)
             local generated, a, b, c, d = oda.handler(stream)
             local channel_bitshift = 8
             local fid = (a & 0xC000) >> 14
-            local fn_msb = (a >> 15) & 1
+            local fn_msb = (a >> 13) & 1
             if fid == 0 and fn_msb == 0 then return true, 0, b, c, d
             elseif fid == 0 and fn_msb == 1 then channel = channel & 0xF
             --FID = 1 means a normal ODA group