diff --git a/icedreammusic/ndi-to-srt/ndi-to-srt.sh b/icedreammusic/ndi-to-srt/ndi-to-srt.sh
index 00bfa3b..e2e86da 100644
--- a/icedreammusic/ndi-to-srt/ndi-to-srt.sh
+++ b/icedreammusic/ndi-to-srt/ndi-to-srt.sh
@@ -50,7 +50,7 @@ do
 
     if [ -z "$found_audio_source" ]
     then
-        offline=$(( found_audio_source + 1 ))
+        offline=$(( offline + 1 ))
     else
         offline=0
     fi