2 files changed, 4 insertions, 2 deletions

diff --git a/lib/libalpm/db.c b/lib/libalpm/db.c
index 3b962d96..760a2fde 100644
--- a/lib/libalpm/db.c
+++ b/lib/libalpm/db.c
@@ -53,7 +53,7 @@ pmdb_t *db_open(char *root, char *dbpath, char *treename)
 		return(NULL);
 	}
 
-	strncpy(db->treename, treename, sizeof(db->treename)-1);
+	strncpy(db->treename, treename, DB_TREENAME_LEN-1);
 
 	db->pkgcache = NULL;
 	db->grpcache = NULL;
diff --git a/lib/libalpm/db.h b/lib/libalpm/db.h
index de8dfe2b..07fa1ef2 100644
--- a/lib/libalpm/db.h
+++ b/lib/libalpm/db.h
@@ -34,10 +34,12 @@
 #define INFRQ_SCRIPLET 0x08
 #define INFRQ_ALL      0xFF
 
+#define DB_TREENAME_LEN 128
+
 /* Database */
 typedef struct __pmdb_t {
 	char *path;
-	char treename[128];
+	char treename[DB_TREENAME_LEN];
 	DIR *dir;
 	PMList *pkgcache;
 	PMList *grpcache;