diff --git a/source/ucli/ucli-lib.cc b/source/ucli/ucli-lib.cc
index 34427b0..31d438a 100644
--- a/source/ucli/ucli-lib.cc
+++ b/source/ucli/ucli-lib.cc
@@ -175,13 +175,13 @@ void diag_printf_raw_stack(int pid, int ns_pid, const char *comm,
 static const char *sys_task_str(int sys_task) {
   switch (sys_task) {
     case 0:
-      return "USER TASK";
+      return "USER_TASK";
     case 1:
-      return "SYSTEM TASK";
+      return "SYSTEM_TASK";
     case 2:
-      return "IDLE TASK";
+      return "IDLE_TASK";
     default:
-      return "UNKNOWN TASK";
+      return "UNKNOWN_TASK";
   }
 }