diff --git a/src/Functions/FunctionsCoding.h b/src/Functions/FunctionsCoding.h
index 428f4891990..a311c6938d6 100644
--- a/src/Functions/FunctionsCoding.h
+++ b/src/Functions/FunctionsCoding.h
@@ -311,7 +311,7 @@ public:
                     std::memcpy(
                         src_ipv4_buf + std::strlen("::ffff:"),
                         reinterpret_cast<const char *>(&vec_src[src_offset]),
-                        std::strlen(reinterpret_cast<const char *>(&vec_src[src_offset])));
+                        std::min(offsets_src[i] - src_offset, IPV4_MAX_TEXT_LENGTH + 1));
                     parseIPv6(src_ipv4_buf, reinterpret_cast<unsigned char *>(&vec_res[out_offset]));
                 }
                 else
diff --git a/tests/queries/0_stateless/00725_ipv4_ipv6_domains.reference b/tests/queries/0_stateless/00725_ipv4_ipv6_domains.reference
index bddd10ba865..e0922ad435d 100644
--- a/tests/queries/0_stateless/00725_ipv4_ipv6_domains.reference
+++ b/tests/queries/0_stateless/00725_ipv4_ipv6_domains.reference
@@ -62,3 +62,6 @@ FFFF:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF is ipv6 string: 	1
 ::ffff:127.0.0.7
 ::ffff:127.0.0.8
 ::ffff:127.0.0.9
+::ffff:127.0.0.10
+::ffff:127.0.0.11
+::ffff:127.0.0.12
diff --git a/tests/queries/0_stateless/00725_ipv4_ipv6_domains.sql b/tests/queries/0_stateless/00725_ipv4_ipv6_domains.sql
index 39f50781a7e..5815afb1605 100644
--- a/tests/queries/0_stateless/00725_ipv4_ipv6_domains.sql
+++ b/tests/queries/0_stateless/00725_ipv4_ipv6_domains.sql
@@ -89,4 +89,4 @@ SELECT '2001:0DB8:AC10:FE01:FEED:BABE:CAFE:F00D is ipv6 string: ', isIPv6String(
 SELECT toIPv6('0.0.0.0');
 SELECT toIPv6('127.0.0.1');
 SELECT cutIPv6(IPv6StringToNum('127.0.0.1'), 0, 0);
-SELECT toIPv6('127.0.0.' || toString(number)) FROM numbers(10);
+SELECT toIPv6('127.0.0.' || toString(number)) FROM numbers(13);