diff --git a/include/extern.h b/include/extern.h
index 6e2960ea2..f8a81c7b7 100644
--- a/include/extern.h
+++ b/include/extern.h
@@ -1,4 +1,4 @@
-/* NetHack 3.6	extern.h	$NHDT-Date: 1545036280 2018/12/17 08:44:40 $  $NHDT-Branch: NetHack-3.6.2-beta01 $:$NHDT-Revision: 1.672 $ */
+/* NetHack 3.6	extern.h	$NHDT-Date: 1545043771 2018/12/17 10:49:31 $  $NHDT-Branch: NetHack-3.6.2-beta01 $:$NHDT-Revision: 1.673 $ */
 /* Copyright (c) Steve Creps, 1988.				  */
 /* NetHack may be freely redistributed.  See license for details. */
 
@@ -974,7 +974,6 @@ E boolean NDECL(have_lizard);
 E struct obj *NDECL(u_have_novel);
 E struct obj *FDECL(o_on, (unsigned int, struct obj *));
 E boolean FDECL(obj_here, (struct obj *, int, int));
-E int FDECL(ckunpaid, (struct obj *));
 E boolean NDECL(wearing_armor);
 E boolean FDECL(is_worn, (struct obj *));
 E struct obj *FDECL(g_at, (int, int));
diff --git a/src/do.c b/src/do.c
index 732e1ed73..3438a44b1 100644
--- a/src/do.c
+++ b/src/do.c
@@ -1,4 +1,4 @@
-/* NetHack 3.6	do.c	$NHDT-Date: 1545036287 2018/12/17 08:44:47 $  $NHDT-Branch: NetHack-3.6.2-beta01 $:$NHDT-Revision: 1.180 $ */
+/* NetHack 3.6	do.c	$NHDT-Date: 1545043771 2018/12/17 10:49:31 $  $NHDT-Branch: NetHack-3.6.2-beta01 $:$NHDT-Revision: 1.181 $ */
 /* Copyright (c) Stichting Mathematisch Centrum, Amsterdam, 1985. */
 /*-Copyright (c) Derek S. Ray, 2015. */
 /* NetHack may be freely redistributed.  See license for details. */
@@ -588,7 +588,7 @@ register struct obj *obj;
 
             /* doname can call s_suffix, reusing its buffer */
             Strcpy(monbuf, s_suffix(mon_nam(u.ustuck)));
-            onam_p = ckunpaid(obj) ? yobjnam(obj, (char *) 0) : doname(obj);
+            onam_p = is_unpaid(obj) ? yobjnam(obj, (char *) 0) : doname(obj);
             You("drop %s into %s %s.", onam_p, monbuf,
                 mbodypart(u.ustuck, STOMACH));
         }
@@ -683,7 +683,7 @@ boolean with_impact;
                 could_grow = (obj->corpsenm == PM_WRAITH);
                 could_heal = (obj->corpsenm == PM_NURSE);
             }
-            if (ckunpaid(obj))
+            if (is_unpaid(obj))
                 (void) stolen_value(obj, u.ux, u.uy, TRUE, FALSE);
             (void) mpickobj(u.ustuck, obj);
             if (is_animal(u.ustuck->data)) {
diff --git a/src/invent.c b/src/invent.c
index 5d89e5545..93939ad86 100644
--- a/src/invent.c
+++ b/src/invent.c
@@ -1,4 +1,4 @@
-/* NetHack 3.6	invent.c	$NHDT-Date: 1545036289 2018/12/17 08:44:49 $  $NHDT-Branch: NetHack-3.6.2-beta01 $:$NHDT-Revision: 1.243 $ */
+/* NetHack 3.6	invent.c	$NHDT-Date: 1545043772 2018/12/17 10:49:32 $  $NHDT-Branch: NetHack-3.6.2-beta01 $:$NHDT-Revision: 1.244 $ */
 /* Copyright (c) Stichting Mathematisch Centrum, Amsterdam, 1985. */
 /*-Copyright (c) Derek S. Ray, 2015. */
 /* NetHack may be freely redistributed.  See license for details. */
@@ -26,6 +26,7 @@ STATIC_DCL void FDECL(compactify, (char *));
 STATIC_DCL boolean FDECL(taking_off, (const char *));
 STATIC_DCL boolean FDECL(putting_on, (const char *));
 STATIC_PTR int FDECL(ckvalidcat, (struct obj *));
+STATIC_PTR int FDECL(ckunpaid, (struct obj *));
 STATIC_PTR char *FDECL(safeq_xprname, (struct obj *));
 STATIC_PTR char *FDECL(safeq_shortxprname, (struct obj *));
 STATIC_DCL char FDECL(display_pickinv, (const char *, const char *,
@@ -1824,7 +1825,7 @@ struct obj *otmp;
     return (int) allow_category(otmp);
 }
 
-int
+STATIC_PTR int
 ckunpaid(otmp)
 struct obj *otmp;
 {