diff --git a/src/core/nm-l3cfg.c b/src/core/nm-l3cfg.c
index 0d93f76bc2..51d7701c31 100644
--- a/src/core/nm-l3cfg.c
+++ b/src/core/nm-l3cfg.c
@@ -624,7 +624,7 @@ _l3_config_notify_data_to_string(const NML3ConfigNotifyData *notify_data,
     case NM_L3_CONFIG_NOTIFY_TYPE_PLATFORM_CHANGE_ON_IDLE:
         nm_strbuf_append(&s,
                          &l,
-                         ", obj-type-flags=0x%x",
+                         ", obj-type-flags=0x%" G_GINT64_MODIFIER "x",
                          notify_data->platform_change_on_idle.obj_type_flags);
         break;
     case NM_L3_CONFIG_NOTIFY_TYPE_IPV4LL_EVENT:
diff --git a/src/core/nm-l3cfg.h b/src/core/nm-l3cfg.h
index 5f0721da3c..cf9b80e442 100644
--- a/src/core/nm-l3cfg.h
+++ b/src/core/nm-l3cfg.h
@@ -178,7 +178,7 @@ typedef struct {
         } platform_change;
 
         struct {
-            guint32 obj_type_flags;
+            guint64 obj_type_flags;
         } platform_change_on_idle;
 
         struct {
diff --git a/src/libnm-platform/nmp-base.h b/src/libnm-platform/nmp-base.h
index f665629645..962736eb34 100644
--- a/src/libnm-platform/nmp-base.h
+++ b/src/libnm-platform/nmp-base.h
@@ -194,10 +194,10 @@ typedef enum _nm_packed {
     NMP_OBJECT_TYPE_MAX = __NMP_OBJECT_TYPE_LAST - 1,
 } NMPObjectType;
 
-static inline guint32
+static inline guint64
 nmp_object_type_to_flags(NMPObjectType obj_type)
 {
-    G_STATIC_ASSERT_EXPR(NMP_OBJECT_TYPE_MAX < 32);
+    G_STATIC_ASSERT_EXPR(NMP_OBJECT_TYPE_MAX < 64);
 
     nm_assert(_NM_INT_NOT_NEGATIVE(obj_type));
     nm_assert(obj_type < NMP_OBJECT_TYPE_MAX);