diff --git a/features/FEATURE_LWIP/lwip-interface/lwipopts.h b/features/FEATURE_LWIP/lwip-interface/lwipopts.h
index e0f81af506..ebd3b61274 100644
--- a/features/FEATURE_LWIP/lwip-interface/lwipopts.h
+++ b/features/FEATURE_LWIP/lwip-interface/lwipopts.h
@@ -108,7 +108,7 @@
 
 // Thread stack size for private PPP thread
 #ifndef MBED_CONF_LWIP_PPP_THREAD_STACKSIZE
-#define MBED_CONF_LWIP_PPP_THREAD_STACKSIZE    512
+#define MBED_CONF_LWIP_PPP_THREAD_STACKSIZE    768
 #endif
 
 #if LWIP_DEBUG
diff --git a/features/FEATURE_LWIP/lwip-interface/mbed_lib.json b/features/FEATURE_LWIP/lwip-interface/mbed_lib.json
index d330cb8886..1fbfcadf87 100644
--- a/features/FEATURE_LWIP/lwip-interface/mbed_lib.json
+++ b/features/FEATURE_LWIP/lwip-interface/mbed_lib.json
@@ -68,7 +68,7 @@
         },
         "ppp-thread-stacksize": {
             "help": "Thread stack size for PPP",
-            "value": 512
+            "value": 768
         }
     }
 }