diff --git a/examples/http-reverse-proxy/Makefile b/examples/http-reverse-proxy/Makefile
index 6ec568ba..6360715b 100644
--- a/examples/http-reverse-proxy/Makefile
+++ b/examples/http-reverse-proxy/Makefile
@@ -1,5 +1,5 @@
 PROG ?= example
-CFLAGS ?= -DMG_IO_SIZE=64
+CFLAGS ?= -DMG_IO_SIZE=128
 MBEDTLS_DIR ?=
 
 ifeq "$(MBEDTLS_DIR)" ""