diff --git a/include/plane.h b/include/plane.h
index 2004373b..a9db76fc 100644
--- a/include/plane.h
+++ b/include/plane.h
@@ -167,7 +167,6 @@ struct shiplook {
 
 double logx(double d, double base);
 
-void count_planes();
 s_char *prplane(struct plnstr *pp);