diff --git a/fuzzers/012-clbn5ffmux/.gitignore b/fuzzers/012-clbn5ffmux/.gitignore
new file mode 100644
index 00000000..ce77578f
--- /dev/null
+++ b/fuzzers/012-clbn5ffmux/.gitignore
@@ -0,0 +1,2 @@
+/specimen_*/
+/*.segbits