diff --git a/libbb/find_root_device.c b/libbb/find_root_device.c
index 7ff65bb..dfe0cfa 100644
--- a/libbb/find_root_device.c
+++ b/libbb/find_root_device.c
@@ -19,6 +19,7 @@
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  */
 
+#include <limits.h>
 #include <stdio.h>
 #include <string.h>
 #include <dirent.h>