diff --git a/src/command/StickerCommands.cxx b/src/command/StickerCommands.cxx
index 5ce689a14..4403c832c 100644
--- a/src/command/StickerCommands.cxx
+++ b/src/command/StickerCommands.cxx
@@ -31,10 +31,12 @@
 #include "util/StringAPI.hxx"
 #include "util/ScopeExit.hxx"
 
+namespace {
 struct sticker_song_find_data {
 	Response &r;
 	const char *name;
 };
+}
 
 static void
 sticker_song_find_print_cb(const LightSong &song, const char *value,
diff --git a/src/sticker/SongSticker.cxx b/src/sticker/SongSticker.cxx
index dba2a29db..cccaeba92 100644
--- a/src/sticker/SongSticker.cxx
+++ b/src/sticker/SongSticker.cxx
@@ -69,6 +69,7 @@ sticker_song_get(const LightSong &song)
 	return sticker_load("song", uri.c_str());
 }
 
+namespace {
 struct sticker_song_find_data {
 	const Database *db;
 	const char *base_uri;
@@ -78,6 +79,7 @@ struct sticker_song_find_data {
 		     void *user_data);
 	void *user_data;
 };
+}
 
 static void
 sticker_song_find_cb(const char *uri, const char *value, void *user_data)