diff --git a/nix/libstore/build.cc b/nix/libstore/build.cc
index a9eedcef1678337c010872c310fce986cda180c3..efe1ab2b17a3ba80122215522fea0ae06f7dccbd 100644
--- a/nix/libstore/build.cc
+++ b/nix/libstore/build.cc
@@ -51,7 +51,7 @@
 #include <linux/fs.h>
 #endif
 
-#define CHROOT_ENABLED HAVE_CHROOT && HAVE_UNSHARE && HAVE_SYS_MOUNT_H && defined(MS_BIND) && defined(MS_PRIVATE) && defined(CLONE_NEWNS) && defined(SYS_pivot_root)
+#define CHROOT_ENABLED HAVE_CHROOT && HAVE_SYS_MOUNT_H && defined(MS_BIND) && defined(MS_PRIVATE) && defined(CLONE_NEWNS) && defined(SYS_pivot_root)
 
 #if CHROOT_ENABLED
 #include <sys/socket.h>