diff --git a/tests/util/grub-fs-tester.in b/tests/util/grub-fs-tester.in
index 986f6677a..1111c4b7d 100644
--- a/tests/util/grub-fs-tester.in
+++ b/tests/util/grub-fs-tester.in
@@ -1304,10 +1304,11 @@ for ((LOGSECSIZE=MINLOGSECSIZE;LOGSECSIZE<=MAXLOGSECSIZE;LOGSECSIZE=LOGSECSIZE +
 	    # is not precise. Account for small difference here.
 	    FSTIMEM1="$(date -d "$FSTIME UTC -1 second" -u "+%Y-%m-%d %H:%M:%S")"
 	    FSTIMEM2="$(date -d "$FSTIME UTC -2 second" -u "+%Y-%m-%d %H:%M:%S")"
+	    FSTIMEM3="$(date -d "$FSTIME UTC -3 second" -u "+%Y-%m-%d %H:%M:%S")"
 
 	    if [ x$NOFSTIME = xy ]; then
 		:
-	    elif echo "$LSOUT" | grep -F 'Last modification time '"$FSTIME" > /dev/null || echo "$LSOUT" | grep -F 'Last modification time '"$FSTIMEM1" > /dev/null || echo "$LSOUT" | grep -F 'Last modification time '"$FSTIMEM2" > /dev/null; then
+	    elif echo "$LSOUT" | grep -F 'Last modification time '"$FSTIME" > /dev/null || echo "$LSOUT" | grep -F 'Last modification time '"$FSTIMEM1" > /dev/null || echo "$LSOUT" | grep -F 'Last modification time '"$FSTIMEM2" || echo "$LSOUT" | grep -F 'Last modification time '"$FSTIMEM3" > /dev/null; then
 		:
 	    else
 		echo FSTIME FAIL