diff --git a/source/libs/function/src/builtins.c b/source/libs/function/src/builtins.c
index 9c004bf1c4..ec8e6b038e 100644
--- a/source/libs/function/src/builtins.c
+++ b/source/libs/function/src/builtins.c
@@ -958,6 +958,7 @@ static bool validateHistogramBinDesc(char* binDescStr, int8_t binType, char* err
     return false;
   }
 
+  cJSON_Delete(binDesc);
   taosMemoryFree(intervals);
   return true;
 }