diff --git a/src/functional/inet_pton.c b/src/functional/inet_pton.c
index 0857b82..b31faed 100644
--- a/src/functional/inet_pton.c
+++ b/src/functional/inet_pton.c
@@ -28,9 +28,9 @@ static void tohex(char *d, void *s, int n)
 
 #define V6(src,ret,hex) do{\
 	int r; \
-	char binaddr[16]; \
-	char hexaddr[40]; \
-	char txtaddr[60]; \
+	char binaddr[16]={0}; \
+	char hexaddr[40]={0}; \
+	char txtaddr[60]={0}; \
 	\
 	r=inet_pton(AF_INET6,src,binaddr); \
 	if (r!=ret) \
@@ -57,7 +57,7 @@ static void tohex(char *d, void *s, int n)
 	int r; \
 	uint32_t a; \
 	struct in_addr in; \
-	char buf[20]; \
+	char buf[20]={0}; \
 	char *p; \
 	\
 	a=inet_addr(src); \
@@ -140,6 +140,13 @@ V6(".192.168.1.1", 0, "")
 V6(":.192.168.1.1", 0, "")
 V6("a:0b:00c:000d:E:F::", 1, "000a000b000c000d000e000f00000000")
 V6("a:0b:00c:000d:0000e:f::", 0, "")
+V6("1:2:3:4:5:6::", 1, "00010002000300040005000600000000")
+V6("1:2:3:4:5:6:7::", 1, "00010002000300040005000600070000")
+V6("1:2:3:4:5:6:7:8::", 0, "")
+V6("1:2:3:4:5:6:7::9", 0, "")
+V6("::1:2:3:4:5:6", 1, "00000000000100020003000400050006")
+V6("::1:2:3:4:5:6:7", 1, "00000001000200030004000500060007")
+V6("::1:2:3:4:5:6:7:8", 0, "")
 V6("a:b::c:d:e:f", 1, "000a000b00000000000c000d000e000f")
 V6("ffff:c0a8:5e4", 0, "")
 V6(":ffff:c0a8:5e4", 0, "")
diff --git a/src/regression/inet_pton-empty-last-field.c b/src/regression/inet_pton-empty-last-field.c
index eef44dc..b06fa11 100644
--- a/src/regression/inet_pton-empty-last-field.c
+++ b/src/regression/inet_pton-empty-last-field.c
@@ -1,16 +1,39 @@
-// '0' last field in an ipv6 address cannot be abbreviated to ::
+// zero compression for the last field in an ipv6 address is (probably) allowed
+// https://tools.ietf.org/html/rfc4291#section-2.2
+// but further fields shouldnt buffer overflow
+#include <stdio.h>
 #include <string.h>
 #include <arpa/inet.h>
 #include "test.h"
 
+static void txt(char *s, unsigned char *buf)
+{
+	int i;
+	sprintf(s, "%04x", buf[0]<<8 | buf[1]);
+	for (i=1; i<8; i++)
+		sprintf(s+5*i, ":%04x", buf[2*i]<<8 | buf[2*i+1]);
+}
+
 int main(void)
 {
+	char s[50], sw[50];
 	unsigned char buf[16];
-	char addr[] = "1:2:3:4:5:6:7::";
+	unsigned char want[16] = {0,1,0,2,0,3,0,4,0,5,0,6,0,7,0,0};
+	char *addr;
+
+	addr = "1:2:3:4:5:6:7::";
+	if (inet_pton(AF_INET6, addr, buf)!=1 || memcmp(buf, want, 16)!=0) {
+		txt(s, buf);
+		txt(sw, want);
+		t_error("inet_pton(%s) returned %s, wanted %s\n",
+			addr, s, sw);
+	}
 
-	if (inet_pton(AF_INET6, addr, buf)) {
-		t_error("inet_pton(%s) returned %x:%x:%x:%x:%x:%x:%x:%x, wanted a failure\n",
-			addr, buf[0], buf[1], buf[2], buf[3], buf[4], buf[5], buf[6], buf[7]);
+	addr = "1:2:3:4:5:6:7::9:10:11:12:13:14:15:16:17:18:19:20";
+	if (inet_pton(AF_INET6, addr, buf)!=0) {
+		txt(s, buf);
+		t_error("inet_pton(%s) returned %s, wanted a failure\n",
+			addr, s);
 	}
 	return t_status;
 }