diff --git a/libraries/ESP8266WebServer/src/ESP8266WebServer.cpp b/libraries/ESP8266WebServer/src/ESP8266WebServer.cpp
index 360876991..0057a2d1b 100644
--- a/libraries/ESP8266WebServer/src/ESP8266WebServer.cpp
+++ b/libraries/ESP8266WebServer/src/ESP8266WebServer.cpp
@@ -520,7 +520,7 @@ readfile:
       arg.value = postArgs[iarg].value;
     }
     _currentArgCount = iarg;
-    
+    if (postArgs) delete[] postArgs;
   }
 }