diff --git a/contrib/libxo/libxo/xo_wcwidth.h b/contrib/libxo/libxo/xo_wcwidth.h
index 773307f3e2de..46d83f0365d2 100644
--- a/contrib/libxo/libxo/xo_wcwidth.h
+++ b/contrib/libxo/libxo/xo_wcwidth.h
@@ -62,8 +62,8 @@
 #include <wchar.h>
 
 struct interval {
-  int first;
-  int last;
+  wchar_t first;
+  wchar_t last;
 };
 
 /* auxiliary function for binary search in interval table */