diff --git a/cocci/isc_x_tobuffer.spatch b/cocci/isc_x_tobuffer.spatch
new file mode 100644
index 0000000000..94cb21a426
--- /dev/null
+++ b/cocci/isc_x_tobuffer.spatch
@@ -0,0 +1,24 @@
+@@
+expression E1, E2;
+@@
+isc_base64_tobuffer
+-(E1, E2, -1)
++(E1, E2, isc_zero_or_more)
+@@
+expression E1, E2;
+@@
+isc_base64_tobuffer
+-(E1, E2, -2)
++(E1, E2, isc_one_or_more)
+@@
+expression E1, E2;
+@@
+isc_hex_tobuffer
+-(E1, E2, -1)
++(E1, E2, isc_zero_or_more)
+@@
+expression E1, E2;
+@@
+isc_hex_tobuffer
+-(E1, E2, -2)
++(E1, E2, isc_one_or_more)