diff --git a/platformio.ini b/platformio.ini
index a4f93b4d0..9d3cc153e 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -114,7 +114,9 @@ lib_deps =
 [env:build_webUI]
 platform = native
 targets = build
-extra_scripts = post:scripts/build_interface.py
+extra_scripts = pre:scripts/build_interface.py
+; Exclude all source files so the C code doesn't build
+build_src_filter = -<*>
 
 ;
 ; Builds for different board types