diff --git a/src/spicelib/devices/bsim4/b4ld.c b/src/spicelib/devices/bsim4/b4ld.c
index 0c86cdb37..d3842c367 100644
--- a/src/spicelib/devices/bsim4/b4ld.c
+++ b/src/spicelib/devices/bsim4/b4ld.c
@@ -1,3 +1,4 @@
+#error "FATAL, on this branch the cuda changes which where intended for bsim4v7 have incorrectly been applied to the bsim4v8 model. Use a newer branch !"
 /**** BSIM4.8.0 Released by Navid Paydavosi 11/01/2013 ****/
 /**** OpenMP support ngspice 06/28/2010 ****/
 /**********