diff --git a/cddl/contrib/opensolaris/cmd/dtrace/test/tst/common/io/tst.fds.c b/cddl/contrib/opensolaris/cmd/dtrace/test/tst/common/io/tst.fds.c
index 2785b51f308..3cded11e852 100644
--- a/cddl/contrib/opensolaris/cmd/dtrace/test/tst/common/io/tst.fds.c
+++ b/cddl/contrib/opensolaris/cmd/dtrace/test/tst/common/io/tst.fds.c
@@ -82,7 +82,7 @@ main(int argc, char *argv[])
 
 	fds[n++] = open(file, O_RDWR | O_APPEND | O_CREAT | O_DSYNC |
 	    O_LARGEFILE | O_NOCTTY | O_NONBLOCK | O_NDELAY | O_RSYNC |
-	    O_SYNC | O_TRUNC | O_XATTR);
+	    O_SYNC | O_TRUNC | O_XATTR, 0666);
 
 	fds[n++] = open(file, O_RDWR);
 	(void) lseek(fds[n - 1], 123, SEEK_SET);