diff --git a/platformio.ini b/platformio.ini
index c49439586e038e2e35810c2a6e68533fd88b206c..a23fc60a0f32ac959d20635c2aa647b51964e02a 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -19,22 +19,26 @@ build_src_filter = +<ch32v003evt>
 ; for examples that use ch32v003fun as their base
 [fun_base]
 board_build.ldscript = ch32v003fun/ch32v003fun.ld
-build_flags = -flto -Ich32v003fun -I/usr/include/newlib -lgcc
+build_flags = -flto -Ich32v003fun -I/usr/include/newlib -DTINYVECTOR -lgcc
 build_src_filter = +<ch32v003fun>
 
 [env:blink]
 extends = fun_base
 build_src_filter = ${fun_base.build_src_filter} +<examples/blink>
 
-[env:fulldemo]
-extends = evt_base
-build_src_filter = ${evt_base.build_src_filter} +<examples/fulldemo>
+[env:debugprintfdemo]
+extends = fun_base
+build_src_filter = ${fun_base.build_src_filter} +<examples/debugprintfdemo>
 
 ; sandbox demo does currently not compile (undefined reference to `__get_dscratch0')
 ;[env:sandbox]
-;extends = evt_base
-;build_src_filter = ${evt_base.build_src_filter} +<examples/sandbox>
+;extends = fun_base
+;build_src_filter = ${fun_base.build_src_filter} +<examples/sandbox>
+
+[env:uartdemo]
+extends = fun_base
+build_src_filter = ${fun_base.build_src_filter} +<examples/uartdemo>
 
 [env:ws2812demo]
-extends = evt_base
+extends = fun_base
 build_src_filter = ${evt_base.build_src_filter} +<examples/ws2812demo>