diff --git a/include/util/tconfig.h b/include/util/tconfig.h
index f109153384..3fc247982f 100644
--- a/include/util/tconfig.h
+++ b/include/util/tconfig.h
@@ -84,11 +84,11 @@ typedef struct SConfigItem {
   };
   union {
     int64_t imin;
-    double  fmin;
+    float   fmin;
   };
   union {
     int64_t imax;
-    double  fmax;
+    float   fmax;
   };
   SArray *array;  // SDiskCfg/SLogVar
 } SConfigItem;
diff --git a/source/util/src/tconfig.c b/source/util/src/tconfig.c
index 5f0ab9a321..42689617a3 100644
--- a/source/util/src/tconfig.c
+++ b/source/util/src/tconfig.c
@@ -199,7 +199,7 @@ static int32_t cfgSetFloat(SConfigItem *pItem, const char *value, ECfgSrcType st
     TAOS_RETURN(TSDB_CODE_OUT_OF_RANGE);
   }
 
-  pItem->fval = (float)dval;
+  pItem->fval = dval;
   pItem->stype = stype;
   TAOS_RETURN(TSDB_CODE_SUCCESS);
 }