diff --git a/apps/enm/services.py b/apps/enm/services.py
index 8295993b..0f436ac9 100644
--- a/apps/enm/services.py
+++ b/apps/enm/services.py
@@ -24,7 +24,7 @@ def translate_eval_formula(exp_str: str, year: int, month: int, day: int, hour:
     matches = re.findall(pattern, exp_str)
     for match in matches:
         if match in ['enm_lhxs']:
-            exp_str = exp_str.replace(f"{{{match}}}", get_sysconfig(f'enm.{match}'))
+            exp_str = exp_str.replace(f"{{{match}}}", str(get_sysconfig(f'enm.{match}')))
         else:
             mpst = MpointStat.objects.filter(Q(mpoint__id=match) | Q(mpoint__name=match) | Q(mpoint__code=match), type="hour", year=year, month=month, day=day, hour=hour).first()
             if mpst: