diff --git a/include/prototypes.h b/include/prototypes.h
index 1272aa40..ee9d524c 100644
--- a/include/prototypes.h
+++ b/include/prototypes.h
@@ -280,8 +280,6 @@ extern int logreopen(void);
 extern void logerror(char *, ...) ATTRIBUTE((format (printf, 1, 2)));
 /* more in misc.h */
 /* mapdist.c */
-extern int deltax(int, int);
-extern int deltay(int, int);
 extern int mapdist(int, int, int, int);
 /* move.c */
 /* in path.h */
diff --git a/src/lib/common/mapdist.c b/src/lib/common/mapdist.c
index 975831cf..759516dc 100644
--- a/src/lib/common/mapdist.c
+++ b/src/lib/common/mapdist.c
@@ -31,17 +31,13 @@
  *
  */
 
-/*
- * mapdist returns (integer) distance between two sectors.
- */
-
 #include <config.h>
 
 #include "misc.h"
 #include "optlist.h"
 #include "prototypes.h"
 
-int
+static int
 deltax(int x1, int x2)
 {
     int dx;
@@ -53,7 +49,7 @@ deltax(int x1, int x2)
     return dx;
 }
 
-int
+static int
 deltay(int y1, int y2)
 {
     int dy;