diff --git a/dwl.c b/dwl.c
index 5a31aee..79ccb34 100644
--- a/dwl.c
+++ b/dwl.c
@@ -674,7 +674,7 @@ cleanup(void)
 #endif
 	wl_display_destroy_clients(dpy);
 	if (child_pid > 0) {
-		kill(child_pid, SIGTERM);
+		kill(-child_pid, SIGTERM);
 		waitpid(child_pid, NULL, 0);
 	}
 	wlr_xcursor_manager_destroy(cursor_mgr);
@@ -2141,6 +2141,7 @@ run(char *startup_cmd)
 		if ((child_pid = fork()) < 0)
 			die("startup: fork:");
 		if (child_pid == 0) {
+			setsid();
 			dup2(piperw[0], STDIN_FILENO);
 			close(piperw[0]);
 			close(piperw[1]);