diff --git a/eac3toac3.sh b/eac3toac3.sh
index dd5c873..540764a 100755
--- a/eac3toac3.sh
+++ b/eac3toac3.sh
@@ -10,7 +10,7 @@ IFILE=$(basename "$MKV_INPUT")
 IFILE="${IFILE%.*}"
 
 # get E-AC3 audio track ID from MKV container
-LINE=$(LANG=C mkvinfo "${MKV_INPUT}" | grep "Track type" | grep -n "audio" | cut -d":" -f1)
+LINE=$(LANG=C mkvinfo "${MKV_INPUT}" | grep "Codec ID" | grep -n "A_EAC3" | cut -d":" -f1)
 AUDIO_ID=$(( $LINE - 1 ))
 
 # extract E-AC3 audio track from MKV container