diff --git a/tests/blif/gatesi.blif.ok b/tests/blif/gatesi.blif.ok
index e99d7906f..8213a8a89 100644
--- a/tests/blif/gatesi.blif.ok
+++ b/tests/blif/gatesi.blif.ok
@@ -1,4 +1,3 @@
-# Generated by Yosys
 
 .model test
 .inputs clk in_a_var[0] in_a_var[1] in_a_var[2] in_a_var[3] in_a_var[4] in_a_var[5] in_a_var[6] in_a_var[7] in_b_var[0] in_b_var[1] in_b_var[2] in_b_var[3] in_b_var[4] in_b_var[5] in_b_var[6] in_b_var[7]
diff --git a/tests/blif/gatesi.ys b/tests/blif/gatesi.ys
index 44c022bb9..0f1ebd911 100644
--- a/tests/blif/gatesi.ys
+++ b/tests/blif/gatesi.ys
@@ -1,2 +1,4 @@
 read_blif gatesi.blif
-write_blif -gatesi gatesi.blif.out
\ No newline at end of file
+write_blif -gatesi gatesi.blif.out
+! tail -n +2 gatesi.blif.out > gatesi.blif.out.tmp && mv gatesi.blif.out.tmp gatesi.blif.out
+! diff gatesi.blif.out gatesi.blif.ok
diff --git a/tests/blif/generate_mk.py b/tests/blif/generate_mk.py
index bd6d74fd9..96aa6be79 100644
--- a/tests/blif/generate_mk.py
+++ b/tests/blif/generate_mk.py
@@ -5,7 +5,4 @@ sys.path.append("..")
 
 import gen_tests_makefile
 
-gen_tests_makefile.generate(["--yosys-scripts"], [],
-"""[ ! -f $(@:.ys=.blif) ] || \\
-    sed '1d' $(@:.ys=.blif).out | diff - <(sed '1d' $(@:.ys=.blif).ok) >/dev/null 2>&1 || exit 1; \\
-""")
\ No newline at end of file
+gen_tests_makefile.generate(["--yosys-scripts"])
\ No newline at end of file