diff --git a/include/lost.h b/include/lost.h
index a7fd6542..1f81eb78 100644
--- a/include/lost.h
+++ b/include/lost.h
@@ -56,8 +56,8 @@ struct loststr {
 
 /* src/lib/subs/lostsub.c */
 extern void lost_and_found(int, natid, natid, int, coord, coord);
-extern void makelost(int, natid, short, coord, coord);
-extern void makenotlost(int, natid, short, coord, coord);
+extern void makelost(int, natid, int, coord, coord);
+extern void makenotlost(int, natid, int, coord, coord);
 extern void delete_old_lostitems(void);
 
 #endif
diff --git a/include/plane.h b/include/plane.h
index b0959663..0079367c 100644
--- a/include/plane.h
+++ b/include/plane.h
@@ -166,8 +166,8 @@ extern void ac_encounter(struct emp_qelem *, struct emp_qelem *, coord,
 			 coord, char *, int);
 
 /* src/lib/subs/aswplnsubs.c */
-extern int on_shiplist(short, struct shiplist *);
-extern void add_shiplist(short, struct shiplist **);
+extern int on_shiplist(int, struct shiplist *);
+extern void add_shiplist(int, struct shiplist **);
 extern void free_shiplist(struct shiplist **);
 extern void print_shiplist(struct shiplist *);
 
diff --git a/src/lib/subs/aswplnsubs.c b/src/lib/subs/aswplnsubs.c
index e5ba1ebf..0cd73c1d 100644
--- a/src/lib/subs/aswplnsubs.c
+++ b/src/lib/subs/aswplnsubs.c
@@ -41,7 +41,7 @@
 #include "ship.h"
 
 int
-on_shiplist(short uid, struct shiplist *head)
+on_shiplist(int uid, struct shiplist *head)
 {
     struct shiplist *s;
 
@@ -55,7 +55,7 @@ on_shiplist(short uid, struct shiplist *head)
 }
 
 void
-add_shiplist(short uid, struct shiplist **head)
+add_shiplist(int uid, struct shiplist **head)
 {
     struct shiplist *s, *s2;
 
diff --git a/src/lib/subs/lostsub.c b/src/lib/subs/lostsub.c
index aa13fb56..f09ef96b 100644
--- a/src/lib/subs/lostsub.c
+++ b/src/lib/subs/lostsub.c
@@ -39,7 +39,7 @@
 #include "misc.h"
 #include "optlist.h"
 
-static int findlost(int, natid, short, coord, coord, int);
+static int findlost(int, natid, int, coord, coord, int);
 
 /*
  * Record item ID of type TYPE changed owner from EXOWN to OWN at X, Y.
@@ -56,7 +56,7 @@ lost_and_found(int type, natid exown, natid own, int id, coord x, coord y)
 }
 
 void
-makelost(int type, natid owner, short id, coord x, coord y)
+makelost(int type, natid owner, int id, coord x, coord y)
 {
     struct loststr lost;
     int n;
@@ -72,7 +72,7 @@ makelost(int type, natid owner, short id, coord x, coord y)
 }
 
 void
-makenotlost(int type, natid owner, short id, coord x, coord y)
+makenotlost(int type, natid owner, int id, coord x, coord y)
 {
     struct loststr lost;
     int n;
@@ -93,7 +93,7 @@ makenotlost(int type, natid owner, short id, coord x, coord y)
  * Else return -1.
  */
 static int
-findlost(int type, natid owner, short id, coord x, coord y, int free)
+findlost(int type, natid owner, int id, coord x, coord y, int free)
 {
     struct loststr lost;
     int n;