diff --git a/calmwm.h b/calmwm.h
index 118ad32..631901d 100644
--- a/calmwm.h
+++ b/calmwm.h
@@ -396,6 +396,7 @@ int dirent_exists(char *);
 int dirent_isdir(char *);
 int dirent_islink(char *);
 int u_spawn(char *);
+void exec_wm(char *);
 
 void  grab_sweep(struct client_ctx *);
 void  grab_drag(struct client_ctx *);
diff --git a/util.c b/util.c
index c7f5ea8..792129d 100644
--- a/util.c
+++ b/util.c
@@ -62,7 +62,7 @@ exec_wm(char *argstr)
 	*ap = NULL;
 	setsid();
 	execvp(args[0], args);
-	err(1, args[0]);
+	warn(args[0]);
 }
 
 int dirent_isdir(char *filename) {