diff --git a/ports-foc/src/lib/l4lx/genode_block.cc b/ports-foc/src/lib/l4lx/genode_block.cc
index edb2a9b866..752bfa2e54 100644
--- a/ports-foc/src/lib/l4lx/genode_block.cc
+++ b/ports-foc/src/lib/l4lx/genode_block.cc
@@ -84,7 +84,7 @@ namespace {
 		private:
 
 			enum Dimensions {
-				TX_BUF_SIZE   = 1024 * 1024
+				TX_BUF_SIZE   = 5 * 1024 * 1024
 			};
 
 			Req_cache                  _cache;