diff --git a/include/crucible/btrfs.h b/include/crucible/btrfs.h
index ee76ca1..2e31c3a 100644
--- a/include/crucible/btrfs.h
+++ b/include/crucible/btrfs.h
@@ -23,6 +23,7 @@
 #undef min
 #undef max
 #undef mutex
+#undef swap
 
 #ifndef BTRFS_FIRST_FREE_OBJECTID