diff --git a/misc.cpp b/misc.cpp
index 6f3a20cde..8169ab256 100644
--- a/misc.cpp
+++ b/misc.cpp
@@ -759,13 +759,6 @@ void shortDisassemble(int source, unsigned short &num_a, unsigned short &num_b)
     num_b = (unsigned short)(source >> 16);
 }
 
-std::string to_string(const YAML::Node &node)
-{
-    std::stringstream ss;
-    ss << node;
-    return ss.str();
-}
-
 int to_int(std::string &s, int def_vaule)
 {
     int retval = 0;
diff --git a/misc.h b/misc.h
index 9bb80b417..0c5d6f551 100644
--- a/misc.h
+++ b/misc.h
@@ -51,7 +51,6 @@ void urlParse(std::string url, std::string &host, std::string &path, int &port,
 void removeUTF8BOM(std::string &data);
 int shortAssemble(unsigned short num_a, unsigned short num_b);
 void shortDisassemble(int source, unsigned short &num_a, unsigned short &num_b);
-std::string to_string(const YAML::Node &node);
 int to_int(std::string &s, int def_vaule = 0);
 
 std::string fileGet(std::string path, bool binary = true);
diff --git a/subexport.cpp b/subexport.cpp
index 2f658c795..3d424215b 100644
--- a/subexport.cpp
+++ b/subexport.cpp
@@ -585,7 +585,7 @@ std::string netchToClash(std::vector<nodeInfo> &nodes, std::string &base_conf, s
 
     rulesetToClash(yamlnode, ruleset_content_array);
 
-    return to_string(yamlnode);
+    return YAML::Dump(yamlnode);
 }
 
 std::string netchToSurge(std::vector<nodeInfo> &nodes, std::string &base_conf, std::vector<ruleset_content> &ruleset_content_array, string_array &extra_proxy_group, int surge_ver, extra_settings &ext)
diff --git a/webserver_libevent.cpp b/webserver_libevent.cpp
index 67811ede0..64ccca593 100644
--- a/webserver_libevent.cpp
+++ b/webserver_libevent.cpp
@@ -2,7 +2,9 @@
 #include <cstdint>
 #include <iostream>
 #include <evhttp.h>
+#ifdef MALLOC_TRIM
 #include <malloc.h>
+#endif // MALLOC_TRIM
 
 #include <string>
 #include <vector>