diff --git a/src/dns-manager/nm-dns-plugin.c b/src/dns-manager/nm-dns-plugin.c
index d47640b1c3..5766a90d43 100644
--- a/src/dns-manager/nm-dns-plugin.c
+++ b/src/dns-manager/nm-dns-plugin.c
@@ -106,7 +106,7 @@ kill_existing (const char *progname, const char *pidfile, const char *kill_match
 		goto out;
 
 	if (strstr (cmdline_contents, kill_match)) {
-		if (kill (pid, 0)) {
+		if (kill (pid, 0) == 0) {
 			nm_log_dbg (LOGD_DNS, "Killing stale %s child process %ld", progname, pid);
 			kill (pid, SIGKILL);
 		}