diff --git a/src/compression_parser.cpp b/src/compression_parser.cpp
index 26504a4..dc83f94 100644
--- a/src/compression_parser.cpp
+++ b/src/compression_parser.cpp
@@ -295,7 +295,8 @@ string CompressionParser::ParseJsonStr(const cJSON *node)
         return "";
     }
     string res(jsonString);
-    free(jsonString);
+    cJSON_free(jsonString);
+    jsonString = nullptr;
     return res;
 }
 
diff --git a/src/resource_util.cpp b/src/resource_util.cpp
index a3f9e6b..adf12bb 100644
--- a/src/resource_util.cpp
+++ b/src/resource_util.cpp
@@ -118,8 +118,8 @@ bool ResourceUtil::SaveToJsonFile(const string &path, const cJSON *root)
     }
     char *jsonString = cJSON_Print(root);
     out << jsonString;
-    free(jsonString);
-
+    cJSON_free(jsonString);
+    jsonString = nullptr;
     out.close();
     return true;
 }