diff --git a/tests/generic/504 b/tests/generic/504
index c7d015db..21d86051 100755
--- a/tests/generic/504
+++ b/tests/generic/504
@@ -51,7 +51,7 @@ flock -x 9
 cat /proc/locks >> $seqres.full
 
 # Checking
-grep -qw $tf_inode /proc/locks || echo "lock info not found"
+grep -q ":$tf_inode " /proc/locks || echo "lock info not found"
 
 # success, all done
 status=0