diff --git a/blockcheck.sh b/blockcheck.sh
index 0226e89..88911fb 100755
--- a/blockcheck.sh
+++ b/blockcheck.sh
@@ -139,7 +139,7 @@ hdrfile_location()
 	# $1 - hdr file
 
 	# some DPIs return CRLF line ending
-	tr -d '\015' <"$1" | sed -nre 's/^[L|l][O|o][C|c][A|a][T|t][I|i][O|o][N|n]:[ \t]*([^ \t]*)[ \t]*$/\1/p'
+	tr -d '\015' <"$1" | sed -nre 's/^[Ll][Oo][Cc][Aa][Tt][Ii][Oo][Nn]:[ \t]*([^ \t]*)[ \t]*$/\1/p'
 }
 curl_test_http()
 {