diff --git a/src/platform/nm-platform-utils.c b/src/platform/nm-platform-utils.c
index f40059a049..074e2c23e4 100644
--- a/src/platform/nm-platform-utils.c
+++ b/src/platform/nm-platform-utils.c
@@ -53,6 +53,15 @@ nmp_utils_if_nametoindex(const char *ifname)
 
 /*****************************************************************************/
 
+NM_UTILS_LOOKUP_STR_DEFINE(nm_platform_link_duplex_type_to_string,
+                           NMPlatformLinkDuplexType,
+                           NM_UTILS_LOOKUP_DEFAULT_WARN(NULL),
+                           NM_UTILS_LOOKUP_STR_ITEM(NM_PLATFORM_LINK_DUPLEX_UNKNOWN, "unknown"),
+                           NM_UTILS_LOOKUP_STR_ITEM(NM_PLATFORM_LINK_DUPLEX_FULL, "full"),
+                           NM_UTILS_LOOKUP_STR_ITEM(NM_PLATFORM_LINK_DUPLEX_HALF, "half"), );
+
+/*****************************************************************************/
+
 typedef struct {
     int       fd;
     const int ifindex;
diff --git a/src/platform/nm-platform-utils.h b/src/platform/nm-platform-utils.h
index 3de40a27d0..38f8a00729 100644
--- a/src/platform/nm-platform-utils.h
+++ b/src/platform/nm-platform-utils.h
@@ -20,6 +20,8 @@ gboolean    nmp_utils_ethtool_set_wake_on_lan(int                      ifindex,
                                               _NMSettingWiredWakeOnLan wol,
                                               const char *             wol_password);
 
+const char *nm_platform_link_duplex_type_to_string(NMPlatformLinkDuplexType duplex);
+
 gboolean nmp_utils_ethtool_get_link_settings(int                       ifindex,
                                              gboolean *                out_autoneg,
                                              guint32 *                 out_speed,
diff --git a/src/platform/nm-platform.c b/src/platform/nm-platform.c
index 5c92c773ff..44c6ee4797 100644
--- a/src/platform/nm-platform.c
+++ b/src/platform/nm-platform.c
@@ -3322,13 +3322,6 @@ nm_platform_ethtool_get_link_settings(NMPlatform *              self,
     return nmp_utils_ethtool_get_link_settings(ifindex, out_autoneg, out_speed, out_duplex);
 }
 
-NM_UTILS_LOOKUP_STR_DEFINE(nm_platform_link_duplex_type_to_string,
-                           NMPlatformLinkDuplexType,
-                           NM_UTILS_LOOKUP_DEFAULT_WARN(NULL),
-                           NM_UTILS_LOOKUP_STR_ITEM(NM_PLATFORM_LINK_DUPLEX_UNKNOWN, "unknown"),
-                           NM_UTILS_LOOKUP_STR_ITEM(NM_PLATFORM_LINK_DUPLEX_FULL, "full"),
-                           NM_UTILS_LOOKUP_STR_ITEM(NM_PLATFORM_LINK_DUPLEX_HALF, "half"), );
-
 /*****************************************************************************/
 
 NMEthtoolFeatureStates *
diff --git a/src/platform/nm-platform.h b/src/platform/nm-platform.h
index 7770492f63..a785144155 100644
--- a/src/platform/nm-platform.h
+++ b/src/platform/nm-platform.h
@@ -2358,8 +2358,6 @@ gboolean nm_platform_ethtool_get_link_ring(NMPlatform *self, int ifindex, NMEtht
 gboolean
 nm_platform_ethtool_set_ring(NMPlatform *self, int ifindex, const NMEthtoolRingState *ring);
 
-const char *nm_platform_link_duplex_type_to_string(NMPlatformLinkDuplexType duplex);
-
 void nm_platform_ip4_dev_route_blacklist_set(NMPlatform *self,
                                              int         ifindex,
                                              GPtrArray * ip4_dev_route_blacklist);