diff --git a/detect_missing_fonts.sh b/detect_missing_fonts.sh
index 54a8235..5e97865 100755
--- a/detect_missing_fonts.sh
+++ b/detect_missing_fonts.sh
@@ -3,7 +3,7 @@
 # Function to check if the file contains SSA/ASS subtitles
 contains_ssa_ass() {
     local file="$1"
-    if mkvmerge -i "$file" | grep -iqE "subtitles.*\(SSA\|ASS\)"; then
+    if mkvmerge -i "$file" | grep -iq "SubStationAlpha"; then
         return 0  # Found SSA/ASS subtitles
     else
         return 1  # No SSA/ASS subtitles
@@ -13,7 +13,7 @@ contains_ssa_ass() {
 # Function to check if the file has attachments
 check_attachments() {
     local file="$1"
-    if ! mkvinfo "$file" | grep -q "Attachment"; then
+    if ! mkvmerge -i "$file" | grep -q "Attachment"; then
         echo "$file"
     fi
 }