diff --git a/src/http.c b/src/http.c
index c04c5850..aafd5483 100644
--- a/src/http.c
+++ b/src/http.c
@@ -308,9 +308,12 @@ static void _http_add_body_bytes(tf_http_connection_t* connection, const void* d
 					connection->fragment_length = 0;
 				}
 				connection->websocket_message_index++;
-				if (connection->body_length > total_length)
+				if (connection->body_length >= total_length)
 				{
-					memmove(connection->body, (char*)connection->body + total_length, connection->body_length - total_length);
+					if (connection->body_length > total_length)
+					{
+						memmove(connection->body, (char*)connection->body + total_length, connection->body_length - total_length);
+					}
 					connection->body_length -= total_length;
 				}
 			}