diff --git a/libreswan-3.26-asn1-zu.patch b/libreswan-3.26-asn1-zu.patch
new file mode 100644
index 0000000..58b68ac
--- /dev/null
+++ b/libreswan-3.26-asn1-zu.patch
@@ -0,0 +1,21 @@
+diff -Naur libreswan-3.26-orig/lib/libswan/asn1.c libreswan-3.26/lib/libswan/asn1.c
+--- libreswan-3.26-orig/lib/libswan/asn1.c	2018-09-16 22:45:52.000000000 -0400
++++ libreswan-3.26/lib/libswan/asn1.c	2018-09-17 00:28:06.726985327 -0400
+@@ -164,7 +164,7 @@
+ 		sig_val->len = len_r;
+ 		/* XXX: need to check len_r and len_s fits in this */
+ 	        sig_val->ptr = alloc_bytes(len_r * 2, "ec points");
+-		DBG(DBG_PARSING, DBG_log(" sig_val  len is %ld",sig_val->len));
++		DBG(DBG_PARSING, DBG_log(" sig_val  len is %zu",sig_val->len));
+ 		/* copy the values of r into signature */
+ 		memcpy(sig_val->ptr,blob->ptr,len_r);
+ 
+@@ -184,7 +184,7 @@
+ 			}
+ 			DBG(DBG_PARSING, DBG_log("  len_s is %d",len_s));
+ 			sig_val->len += len_s;
+-			DBG(DBG_PARSING, DBG_log(" sig_val total len is %ld",sig_val->len));
++			DBG(DBG_PARSING, DBG_log(" sig_val total len is %zu",sig_val->len));
+ 			/* copy the values of r into signature */
+ 			memcpy(sig_val->ptr+len_r,blob->ptr,len_s);
+ 		}