redirect all warnings to fwarning function and control the output with --quiet

1 files changed, 1 insertions, 1 deletions

diff --git a/src/firejail/join.c b/src/firejail/join.c
index a4b16ff8d..2f6f070e0 100644
--- a/src/firejail/join.c
+++ b/src/firejail/join.c
@@ -308,7 +308,7 @@ void join(pid_t pid, int argc, char **argv, int index) {
                         int rv = nice(cfg.nice);
                         (void) rv;
                         if (errno) {
-                                fprintf(stderr, "Warning: cannot set nice value\n");
+                                fwarning("cannot set nice value\n");
                                 errno = 0;
                         }
                 }