diff --git a/features/net/FEATURE_IPV6/nanostack-interface/NanostackInterface.cpp b/features/net/FEATURE_IPV6/nanostack-interface/NanostackInterface.cpp
index 9cd5688c42b..6571d7faba8 100644
--- a/features/net/FEATURE_IPV6/nanostack-interface/NanostackInterface.cpp
+++ b/features/net/FEATURE_IPV6/nanostack-interface/NanostackInterface.cpp
@@ -368,6 +368,7 @@ void NanostackSocket::data_free_all(void)
     // No mode requirement
 
     NanostackBuffer *buffer = rxBufChain;
+    rxBufChain = NULL;
     while (buffer != NULL) {
         NanostackBuffer *next_buffer = buffer->next;
         FREE(buffer);