diff --git a/HName.h b/HName.h
index 2facfe2d1..e78b7bb3f 100644
--- a/HName.h
+++ b/HName.h
@@ -22,6 +22,7 @@
 # include  <iostream>
 # include  <list>
 # include  "StringHeap.h"
+# include  <climits>
 #ifdef __GNUC__
 #if __GNUC__ > 2
 using namespace std;