diff --git a/src/config.cc b/src/config.cc
index 4e7f9b2..3dc7e15 100644
--- a/src/config.cc
+++ b/src/config.cc
@@ -6,6 +6,7 @@
 
 #include <ctype.h>
 #include <errno.h>
+#include <limits.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>