diff --git a/src/lib/update/ship.c b/src/lib/update/ship.c
index 861304a1..dedd6634 100644
--- a/src/lib/update/ship.c
+++ b/src/lib/update/ship.c
@@ -120,7 +120,7 @@ upd_ship(struct shpstr *sp, int etus,
     int max_oil;
     int max_food;
     struct pchrstr *product;
-    s_char *resource;
+    u_char *resource;
     int dep;
     int n;
     int mult;