diff --git a/SLS_C/build.py b/SLS_C/build.py
index 24d8c67..a111233 100644
--- a/SLS_C/build.py
+++ b/SLS_C/build.py
@@ -400,7 +400,7 @@ def build_macos():
 # ---------------------------------------------------------------------
 def build_main():
     sources = list(SRC_DIR.glob("*.c"))
-    objects = [compile_source(s, is_test=False) for s in sources]
+    objects = [compile_source(s, is_test=False) for s in sources if s.name != 'pico_main.c']
     link_executable(objects, TARGET)