diff --git a/ampel-firmware.h b/ampel-firmware.h
index 9fc089a6fd44fea1a4c2203b9bf664f0c513e7b0..670c91d3eed7f9d96b38345a0941fc631182c90a 100644
--- a/ampel-firmware.h
+++ b/ampel-firmware.h
@@ -6,7 +6,7 @@
 //TODO: check header dependencies, and simplify if possible.
 #include "config.h"
 #ifndef MEASUREMENT_TIMESTEP
-#  error Missing config.h file. Please copy config.example.h to config.h.
+#  error Missing config.h file. Please copy config.public.h to config.h.
 #endif
 
 #ifdef AMPEL_CSV