diff --git a/src/basic/cgroup-util.c b/src/basic/cgroup-util.c
index 7949dd7d70..a8e4a1bb2d 100644
--- a/src/basic/cgroup-util.c
+++ b/src/basic/cgroup-util.c
@@ -1238,7 +1238,7 @@ static const char *skip_session(const char *p) {
                  * here. */
 
                 if (!session_id_valid(buf))
-                        return false;
+                        return NULL;
 
                 p += n;
                 p += strspn(p, "/");
diff --git a/src/basic/hashmap.c b/src/basic/hashmap.c
index cdf7db612c..322b148b31 100644
--- a/src/basic/hashmap.c
+++ b/src/basic/hashmap.c
@@ -1753,7 +1753,7 @@ HashmapBase* _hashmap_copy(HashmapBase *h  HASHMAP_DEBUG_PARAMS) {
         }
 
         if (r < 0)
-                return _hashmap_free(copy, false, false);
+                return _hashmap_free(copy, NULL, NULL);
 
         return copy;
 }
diff --git a/src/libsystemd-network/sd-dhcp-lease.c b/src/libsystemd-network/sd-dhcp-lease.c
index d9db35fbac..b14ad57071 100644
--- a/src/libsystemd-network/sd-dhcp-lease.c
+++ b/src/libsystemd-network/sd-dhcp-lease.c
@@ -995,7 +995,7 @@ int dhcp_lease_save(sd_dhcp_lease *lease, const char *lease_file) {
         r = sd_dhcp_lease_get_router(lease, &addresses);
         if (r > 0) {
                 fputs("ROUTER=", f);
-                serialize_in_addrs(f, addresses, r, false, NULL);
+                serialize_in_addrs(f, addresses, r, NULL, NULL);
                 fputc('\n', f);
         }
 
@@ -1030,21 +1030,21 @@ int dhcp_lease_save(sd_dhcp_lease *lease, const char *lease_file) {
         r = sd_dhcp_lease_get_dns(lease, &addresses);
         if (r > 0) {
                 fputs("DNS=", f);
-                serialize_in_addrs(f, addresses, r, false, NULL);
+                serialize_in_addrs(f, addresses, r, NULL, NULL);
                 fputc('\n', f);
         }
 
         r = sd_dhcp_lease_get_ntp(lease, &addresses);
         if (r > 0) {
                 fputs("NTP=", f);
-                serialize_in_addrs(f, addresses, r, false, NULL);
+                serialize_in_addrs(f, addresses, r, NULL, NULL);
                 fputc('\n', f);
         }
 
         r = sd_dhcp_lease_get_sip(lease, &addresses);
         if (r > 0) {
                 fputs("SIP=", f);
-                serialize_in_addrs(f, addresses, r, false, NULL);
+                serialize_in_addrs(f, addresses, r, NULL, NULL);
                 fputc('\n', f);
         }