diff --git a/src/network/networkd-address-generation.c b/src/network/networkd-address-generation.c
index 04b80dee86..2d574ee78b 100644
--- a/src/network/networkd-address-generation.c
+++ b/src/network/networkd-address-generation.c
@@ -37,7 +37,7 @@ typedef struct IPv6Token {
         struct in6_addr address;
 } IPv6Token;
 
-void generate_eui64_address(const Link *link, const struct in6_addr *prefix, struct in6_addr *ret) {
+static void generate_eui64_address(const Link *link, const struct in6_addr *prefix, struct in6_addr *ret) {
         assert(link);
         assert(prefix);
         assert(ret);
diff --git a/src/network/networkd-address-generation.h b/src/network/networkd-address-generation.h
index 8aa5d4d3f5..391a6ccc97 100644
--- a/src/network/networkd-address-generation.h
+++ b/src/network/networkd-address-generation.h
@@ -7,8 +7,6 @@
 
 typedef struct Link Link;
 
-void generate_eui64_address(const Link *link, const struct in6_addr *prefix, struct in6_addr *ret);
-
 int dhcp6_pd_generate_addresses(Link *link, const struct in6_addr *prefix, Set **ret);
 int ndisc_generate_addresses(Link *link, const struct in6_addr *prefix, uint8_t prefixlen, Set **ret);
 int radv_generate_addresses(Link *link, Set *tokens, const struct in6_addr *prefix, uint8_t prefixlen, Set **ret);