diff --git a/src/read.c b/src/read.c
index 46f838426..f1fef012d 100644
--- a/src/read.c
+++ b/src/read.c
@@ -29,6 +29,7 @@ STATIC_DCL void FDECL(forget, (int));
 STATIC_DCL int FDECL(maybe_tame, (struct monst *, struct obj *));
 STATIC_DCL boolean FDECL(is_valid_stinking_cloud_pos, (int, int, BOOLEAN_P));
 STATIC_DCL void FDECL(display_stinking_cloud_positions, (int));
+STATIC_DCL boolean FDECL(get_valid_stinking_cloud_pos, (int, int));
 STATIC_PTR void FDECL(set_lit, (int, int, genericptr));
 
 STATIC_OVL boolean
@@ -915,7 +916,7 @@ struct obj *sobj;
     return 0;
 }
 
-boolean
+STATIC_OVL boolean
 get_valid_stinking_cloud_pos(x,y)
 int x,y;
 {