diff --git a/esp8266/Makefile b/esp8266/Makefile
index ff35689f4d..4e75ee667c 100644
--- a/esp8266/Makefile
+++ b/esp8266/Makefile
@@ -234,7 +234,7 @@ $(BUILD)/libaxtls.a:
 	cd ../lib/axtls; cp config/upyconfig config/.config
 	cd ../lib/axtls; $(MAKE) oldconfig -B
 	cd ../lib/axtls; $(MAKE) clean
-	cd ../lib/axtls; $(MAKE) all CC="$(CC)" LD="$(LD)" AR="$(AR)" CFLAGS_EXTRA="$(CFLAGS_XTENSA) -Dabort=abort_ -DRT_MAX_PLAIN_LENGTH=1024 -DRT_EXTRA=3072"
+	cd ../lib/axtls; $(MAKE) all CC="$(CC)" LD="$(LD)" AR="$(AR)" CFLAGS_EXTRA="$(CFLAGS_XTENSA) -Dabort=abort_ -DRT_MAX_PLAIN_LENGTH=1024 -DRT_EXTRA=4096"
 	cp ../lib/axtls/_stage/libaxtls.a $@
 
 clean-modules: