diff --git a/src/lib/commands/path.c b/src/lib/commands/path.c
index 8ecea9d8..2aeda497 100644
--- a/src/lib/commands/path.c
+++ b/src/lib/commands/path.c
@@ -102,7 +102,7 @@ path(void)
     snxtsct_area(&ns, &absrange);
     natp = getnatp(player->cnum);
     xyrelrange(natp, &absrange, &relrange);
-    blankfill((s_char *)mapbuf, &ns.range, 3);
+    blankfill(mapbuf, &ns.range, 3);
     for (; *pp; ++pp) {
 	i = diridx(*pp);
 	if (i == DIR_STOP)
diff --git a/src/lib/commands/rout.c b/src/lib/commands/rout.c
index 86029ae6..f4a6a036 100644
--- a/src/lib/commands/rout.c
+++ b/src/lib/commands/rout.c
@@ -101,7 +101,7 @@ rout(void)
     natp = getnatp(player->cnum);
     xyrelrange(natp, &ns.range, &relrange);
     memset(mapbuf, 0, ((WORLD_Y * MAPWIDTH(3))));
-    blankfill((s_char *)mapbuf, &ns.range, 3);
+    blankfill(mapbuf, &ns.range, 3);
     border(&relrange, "     ", " ");
 
     while (nxtsct(&ns, &sect)) {
diff --git a/src/lib/commands/sect.c b/src/lib/commands/sect.c
index af9607a0..79182c80 100644
--- a/src/lib/commands/sect.c
+++ b/src/lib/commands/sect.c
@@ -89,7 +89,7 @@ sct(void)
     ns.ncond = 0;
     xyrelrange(getnatp(player->cnum), &ns.range, &range);
     border(&range, "    ", "");
-    blankfill((s_char *)mapbuf, &ns.range, 1);
+    blankfill(mapbuf, &ns.range, 1);
     while (nxtsct(&ns, &sect)) {
 	if (!player->owner)
 	    continue;
diff --git a/src/lib/commands/surv.c b/src/lib/commands/surv.c
index 3e6b6c8d..c4d7d618 100644
--- a/src/lib/commands/surv.c
+++ b/src/lib/commands/surv.c
@@ -109,7 +109,7 @@ surv(void)
     np = getnatp(player->cnum);
     xyrelrange(np, &nstr.range, &range);
     border(&range, "     ", "");
-    blankfill((s_char *)mapbuf, &nstr.range, 1);
+    blankfill(mapbuf, &nstr.range, 1);
     while (nxtsct(&nstr, &sect)) {
 	if (!player->owner)
 	    continue;
diff --git a/src/lib/commands/wing.c b/src/lib/commands/wing.c
index 5448b816..593335ac 100644
--- a/src/lib/commands/wing.c
+++ b/src/lib/commands/wing.c
@@ -64,7 +64,7 @@ wing(void)
     if (!snxtitem(&nstr, EF_PLANE, player->argp[2]))
 	return RET_SYN;
     count = 0;
-    while (nxtitem(&nstr, (s_char *)&plane)) {
+    while (nxtitem(&nstr, &plane)) {
 	if (plane.pln_own != player->cnum)
 	    continue;
 	if (plane.pln_wing == c)
diff --git a/src/lib/common/maps.c b/src/lib/common/maps.c
index 4dd5a635..7c43be56 100644
--- a/src/lib/common/maps.c
+++ b/src/lib/common/maps.c
@@ -104,7 +104,7 @@ draw_map(int bmap, s_char origin, int map_flags, struct nstr_sect *nsp)
     nsp->ncond = 0;
     xyrelrange(np, &nsp->range, &range);
     border(&range, "     ", "");
-    blankfill((s_char *)wmapbuf, &nsp->range, 1);
+    blankfill(wmapbuf, &nsp->range, 1);
     if (bmap) {
 	int c;
 	switch (bmap) {
diff --git a/src/lib/subs/radmap.c b/src/lib/subs/radmap.c
index d22fba40..0b78b3cb 100644
--- a/src/lib/subs/radmap.c
+++ b/src/lib/subs/radmap.c
@@ -119,7 +119,7 @@ radmap2(int owner,
 	pr("%s efficiency %d%%, max range %d\n",
 	   xyas(cx, cy, owner), eff, range);
     snxtsct_dist(&ns, cx, cy, range);
-    blankfill((s_char *)radbuf, &ns.range, 1);
+    blankfill(radbuf, &ns.range, 1);
     while (nxtsct(&ns, &sect)) {
 	if (sect.sct_own == owner
 	    || sect.sct_type == SCT_WATER
diff --git a/src/lib/subs/satmap.c b/src/lib/subs/satmap.c
index 14495b83..e39cb528 100644
--- a/src/lib/subs/satmap.c
+++ b/src/lib/subs/satmap.c
@@ -105,7 +105,7 @@ satmap(int x, int y, int eff, int range, int flags, int type)
 	else
 	    snxtsct_dist(&ns, x, y, range);
 
-	blankfill((s_char *)radbuf, &ns.range, 1);
+	blankfill(radbuf, &ns.range, 1);
 	if (flags & P_S) {
 	    pr("Satellite sector report\n");
 	    prdate();