diff --git a/man/systemd.resource-control.xml b/man/systemd.resource-control.xml
index d9b570e232..827f343a50 100644
--- a/man/systemd.resource-control.xml
+++ b/man/systemd.resource-control.xml
@@ -775,7 +775,7 @@ BPFProgram=bind6:/sys/fs/bpf/sock-addr-hook
 
           <para><replaceable>bind-rule</replaceable> := [<replaceable>address-family</replaceable><constant>:</constant>]<replaceable>ip-ports</replaceable></para>
 
-          <para><replaceable>address-family</replaceable> := { <constant>IPv4</constant> | <constant>IPv6</constant> }</para>
+          <para><replaceable>address-family</replaceable> := { <constant>ipv4</constant> | <constant>ipv6</constant> }</para>
 
           <para><replaceable>ip-ports</replaceable> := { <replaceable>ip-port</replaceable> | <replaceable>ip-port-range</replaceable> |
           <constant>any</constant> }</para>
@@ -812,7 +812,7 @@ BPFProgram=bind6:/sys/fs/bpf/sock-addr-hook
           <para>Examples:<programlisting>…
 # Allow binding IPv6 socket addresses with a port greater than or equal to 10000.
 [Service]
-SocketBindAllow=IPv6:10000-65535
+SocketBindAllow=ipv6:10000-65535
 SocketBindDeny=any
 …
 # Allow binding IPv4 and IPv6 socket addresses with 1234 and 4321 ports.
@@ -823,7 +823,7 @@ SocketBindDeny=any
 …
 # Deny binding IPv6 socket addresses.
 [Service]
-SocketBindDeny=IPv6:any
+SocketBindDeny=ipv6:any
 …
 # Deny binding IPv4 and IPv6 socket addresses.
 [Service]
diff --git a/src/core/cgroup.c b/src/core/cgroup.c
index a44cf9368c..87e8cdf7ee 100644
--- a/src/core/cgroup.c
+++ b/src/core/cgroup.c
@@ -594,8 +594,9 @@ void cgroup_context_dump(Unit *u, FILE* f, const char *prefix) {
 }
 
 void cgroup_context_dump_socket_bind_item(const CGroupSocketBindItem *item, FILE *f) {
-        const char *family = item->address_family == AF_INET ? "IPv4:" :
-                item->address_family == AF_INET6 ? "IPv6:" : "";
+        const char *family =
+                item->address_family == AF_INET ? "ipv4:" :
+                item->address_family == AF_INET6 ? "ipv6:" : "";
 
         if (item->nr_ports == 0)
                 fprintf(f, " %sany", family);
diff --git a/src/core/load-fragment.c b/src/core/load-fragment.c
index 2399089492..a7d1cb6f12 100644
--- a/src/core/load-fragment.c
+++ b/src/core/load-fragment.c
@@ -5661,13 +5661,13 @@ int config_parse_cgroup_socket_bind(
         }
 
         if (rvalue) {
-                if (streq(word, "IPv4"))
+                if (streq(word, "ipv4"))
                         af = AF_INET;
-                else if (streq(word, "IPv6"))
+                else if (streq(word, "ipv6"))
                         af = AF_INET6;
                 else {
                         log_syntax(unit, LOG_WARNING, filename, line, 0,
-                                   "Only IPv4 and IPv6 protocols are supported, ignoring.");
+                                   "Only \"ipv4\" and \"ipv6\" protocols are supported, ignoring.");
                         return 0;
                 }
 
diff --git a/src/shared/bus-unit-util.c b/src/shared/bus-unit-util.c
index 20d368efca..4d53aaa3da 100644
--- a/src/shared/bus-unit-util.c
+++ b/src/shared/bus-unit-util.c
@@ -879,14 +879,13 @@ static int bus_append_cgroup_property(sd_bus_message *m, const char *field, cons
 
                         address_family = eq ? word : NULL;
                         if (address_family) {
-                                if (!STR_IN_SET(address_family, "IPv4", "IPv6"))
-                                        return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
-                                                "Only IPv4 and IPv6 protocols are supported");
-
-                                if (streq(address_family, "IPv4"))
+                                if (streq(address_family, "ipv4"))
                                         family = AF_INET;
-                                else
+                                else if (streq(address_family, "ipv6"))
                                         family = AF_INET6;
+                                else
+                                        return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+                                                               "Only \"ipv4\" and \"ipv6\" protocols are supported");
                         }
 
                         user_port = eq ? eq : word;
diff --git a/src/systemctl/systemctl-show.c b/src/systemctl/systemctl-show.c
index 2df05464c6..d43f1cf094 100644
--- a/src/systemctl/systemctl-show.c
+++ b/src/systemctl/systemctl-show.c
@@ -1717,7 +1717,7 @@ static int print_property(const char *name, const char *expected_value, sd_bus_m
                         if (r < 0)
                                 return bus_log_parse_error(r);
                         while ((r = sd_bus_message_read(m, "(iqq)", &af, &nr_ports, &port_min)) > 0) {
-                                family = af == AF_INET ? "IPv4:" : af == AF_INET6 ? "IPv6:" : "";
+                                family = af == AF_INET ? "ipv4:" : af == AF_INET6 ? "ipv6:" : "";
                                 if (nr_ports == 0)
                                         bus_print_property_valuef(name, expected_value, flags, "%sany", family);
                                 else if (nr_ports == 1)
diff --git a/src/test/test-socket-bind.c b/src/test/test-socket-bind.c
index bfe5072bc3..16cfea7779 100644
--- a/src/test/test-socket-bind.c
+++ b/src/test/test-socket-bind.c
@@ -141,8 +141,8 @@ int main(int argc, char *argv[]) {
         assert_se(manager_startup(m, NULL, NULL) >= 0);
 
         assert_se(test_socket_bind(m, "socket_bind_test.service", netcat_path, "2000", STRV_MAKE("2000"), STRV_MAKE("any")) >= 0);
-        assert_se(test_socket_bind(m, "socket_bind_test.service", netcat_path, "2000", STRV_MAKE("IPv6:2001-2002"), STRV_MAKE("any")) >= 0);
-        assert_se(test_socket_bind(m, "socket_bind_test.service", netcat_path, "6666", STRV_MAKE("IPv4:6666", "6667"), STRV_MAKE("any")) >= 0);
+        assert_se(test_socket_bind(m, "socket_bind_test.service", netcat_path, "2000", STRV_MAKE("ipv6:2001-2002"), STRV_MAKE("any")) >= 0);
+        assert_se(test_socket_bind(m, "socket_bind_test.service", netcat_path, "6666", STRV_MAKE("ipv4:6666", "6667"), STRV_MAKE("any")) >= 0);
         assert_se(test_socket_bind(m, "socket_bind_test.service", netcat_path, "6666", STRV_MAKE("6667", "6668", ""), STRV_MAKE("any")) >= 0);
         assert_se(test_socket_bind(m, "socket_bind_test.service", netcat_path, "7777", STRV_MAKE_EMPTY, STRV_MAKE_EMPTY) >= 0);
         assert_se(test_socket_bind(m, "socket_bind_test.service", netcat_path, "8888", STRV_MAKE("any"), STRV_MAKE("any")) >= 0);