diff --git a/util.h b/util.h
index 291a68d7..d2059379 100644
--- a/util.h
+++ b/util.h
@@ -10,7 +10,7 @@ static inline const char *
 thrd_err_as_string(int thrd_err)
 {
     switch (thrd_err) {
-    case thrd_success:   return "success";
+    case thrd_success:  return "success";
     case thrd_busy:     return "busy";
     case thrd_nomem:    return "no memory";
     case thrd_timedout: return "timedout";