diff --git a/src/db/DatabasePrint.cxx b/src/db/DatabasePrint.cxx
index c8ffa102f..2a13b28e6 100644
--- a/src/db/DatabasePrint.cxx
+++ b/src/db/DatabasePrint.cxx
@@ -245,7 +245,7 @@ PrintUniqueTag(Client &client, TagType tag_type,
 }
 
 bool
-listAllUniqueTags(Client &client, int type,
+listAllUniqueTags(Client &client, unsigned type,
 		  const SongFilter *filter,
 		  Error &error)
 {
diff --git a/src/db/DatabasePrint.hxx b/src/db/DatabasePrint.hxx
index ef75dae36..da8fecece 100644
--- a/src/db/DatabasePrint.hxx
+++ b/src/db/DatabasePrint.hxx
@@ -51,7 +51,7 @@ searchStatsForSongsIn(Client &client, const char *name,
 		      Error &error);
 
 bool
-listAllUniqueTags(Client &client, int type,
+listAllUniqueTags(Client &client, unsigned type,
 		  const SongFilter *filter,
 		  Error &error);