diff --git a/trunk/src/or/or.h b/trunk/src/or/or.h
index 8bb41f6d9f..f68cd16c9f 100644
--- a/trunk/src/or/or.h
+++ b/trunk/src/or/or.h
@@ -34,6 +34,9 @@
 #endif
 #include "../common/torint.h"
 #include "../common/fakepoll.h"
+#ifdef HAVE_SYS_LIMITS_H
+#include <sys/limits.h>
+#endif
 #ifdef HAVE_SYS_TYPES_H
 #include <sys/types.h> /* Must be included before sys/stat.h for Ultrix */
 #endif