diff --git a/include/nat.h b/include/nat.h
index 5b94b89f..1ff81663 100644
--- a/include/nat.h
+++ b/include/nat.h
@@ -40,6 +40,17 @@
 
 #define	MAXNOR		50	/* max # realms */
 
+enum {				/* Priorities */
+    /* sector types are also priorities */
+    PRI_SMAINT = SCT_MAXDEF+1,	/* ship maintenance */
+    PRI_PMAINT,			/* plane maintenance */
+    PRI_LMAINT,			/* land unit maintenance */
+    PRI_SBUILD,			/* ship building */
+    PRI_PBUILD,			/* plane building */
+    PRI_LBUILD,			/* land building */
+    PRI_MAX = PRI_LBUILD
+};
+
 struct boundstr {
     short b_xl, b_xh;		/* horizontal bounds */
     short b_yl, b_yh;		/* vertical bounds */
@@ -75,20 +86,12 @@ struct natstr {
     struct boundstr nat_b[MAXNOR];	/* realm bounds */
     short nat_relate[MAXNOC];
     short nat_contact[MAXNOC];
-    short nat_rejects[(MAXNOC + 3) / 4];	/* four bits for each country */
-    s_char nat_priorities[SCT_MAXDEF + 8];	/* priority for each SCT_MAXDEF+8 */
+    short nat_rejects[(MAXNOC + 3) / 4]; /* four bits for each country */
+    s_char nat_priorities[PRI_MAX+1]; /* budget priority */
     long nat_flags;		/* nation flags */
     char nat_spare[15];
 };
 
-	/* Priorities */
-#define	PRI_SMAINT	SCT_MAXDEF+2
-#define PRI_PMAINT	SCT_MAXDEF+3
-#define PRI_LMAINT	SCT_MAXDEF+4
-#define PRI_SBUILD	SCT_MAXDEF+5
-#define PRI_PBUILD	SCT_MAXDEF+6
-#define PRI_LBUILD	SCT_MAXDEF+7
-
 	/* nation status types */
 #define STAT_INUSE	bit(0)	/* cnum in use */
 #define STAT_SANCT	bit(1)	/* country in sanctuary */
diff --git a/src/lib/commands/add.c b/src/lib/commands/add.c
index ea6d0926..5ff45b30 100644
--- a/src/lib/commands/add.c
+++ b/src/lib/commands/add.c
@@ -230,7 +230,7 @@ add(void)
     } else
 	pr("No special initializations done...\n");
 
-    for (i = 0; i < SCT_MAXDEF + 8; i++)
+    for (i = 0; i <= PRI_MAX; i++)
 	natp->nat_priorities[i] = -1;
     natp->nat_flags =
 	NF_FLASH | NF_BEEP | NF_COASTWATCH | NF_SONAR | NF_TECHLISTS;
diff --git a/src/lib/commands/budg.c b/src/lib/commands/budg.c
index 36908dab..24d5da0f 100644
--- a/src/lib/commands/budg.c
+++ b/src/lib/commands/budg.c
@@ -65,7 +65,7 @@ budg(void)
 {
     s_char stype = 0, *pq;
     int priority, x;
-    long p_sect[SCT_MAXDEF + 1][2];
+    long p_sect[SCT_MAXDEF+1][2];
     int taxes = 0, bars = 0, mil = 0;
     int Ncivs = 0, Nuws = 0, Nbars = 0;
     int n, etu;
@@ -108,11 +108,11 @@ budg(void)
     if (pq != (s_char *)0) {
 	if (isdigit(*pq)) {
 	    priority = (atoi(pq) < 0 ? -1 * atoi(pq) : atoi(pq));
-	    if (priority >= SCT_MAXDEF + 8) {
-		pr("Priorities must be less than %d!\n", SCT_MAXDEF + 8);
+	    if (priority > PRI_MAX) {
+		pr("Priorities must be less than %d!\n", PRI_MAX + 1);
 		return RET_FAIL;
 	    }
-	    for (x = 0; x < SCT_MAXDEF + 8; x++)
+	    for (x = 0; x <= PRI_MAX; x++)
 		if (priority && (np->nat_priorities[x] == priority)) {
 		    pr("Priorities must be unique!\n");
 		    return RET_FAIL;
@@ -158,7 +158,7 @@ budg(void)
 	    }
 	}
 	if (which == -1) {
-	    for (x = 0; x < SCT_MAXDEF + 8; x++) {
+	    for (x = 0; x <= PRI_MAX; x++) {
 		np->nat_priorities[x] = -1;
 	    }
 	} else {
@@ -175,7 +175,7 @@ budg(void)
 
     income = taxes + bars;
     pr("Sector Type\t\tAbbr\tProduction\tPriority\t    Cost\n");
-    for (x = 0; x < SCT_MAXDEF + 1; x++) {
+    for (x = 0; x <= SCT_MAXDEF; x++) {
 	if (!p_sect[x][1] && np->nat_priorities[x] == -1)
 	    continue;
 	if (!pchr[dchr[x].d_prd].p_cost &&
@@ -355,8 +355,8 @@ calc_all(long int (*p_sect)[2], int *taxes, int *Ncivs, int *Nuws,
 
     *mil += (int)upd_slmilcosts(np->nat_cnum, etu);
 
-    for (y = 1; y < SCT_MAXDEF + 8; y++) {
-	for (z = 0; z < SCT_MAXDEF + 8; z++)
+    for (y = 1; y <= PRI_MAX; y++) {
+	for (z = 0; z <= PRI_MAX; z++)
 	    if (np->nat_priorities[z] == y)
 		switch (z) {
 		case PRI_SMAINT:
diff --git a/src/lib/subs/show.c b/src/lib/subs/show.c
index 9caccd8d..fa8cd3d7 100644
--- a/src/lib/subs/show.c
+++ b/src/lib/subs/show.c
@@ -624,7 +624,7 @@ show_sect_build(int foo)
 {
     register int x, first = 1;
 
-    for (x = 5; x < SCT_MAXDEF + 2; x++) {
+    for (x = 0; x <= SCT_MAXDEF; x++) {
 	if (dchr[x].d_mnem == 0)
 	    continue;
 	if ((dchr[x].d_cost > 0) || (dchr[x].d_build != 1) ||
@@ -658,7 +658,7 @@ show_sect_stats(int foo)
     natp = getnatp(player->cnum);
     /* We fake this */
     sect.sct_effic = 100;
-    for (x = 0; x < SCT_MAXDEF + 2; x++) {
+    for (x = 0; x <= SCT_MAXDEF; x++) {
 	if (dchr[x].d_mnem == 0)
 	    continue;
 	if (first) {
@@ -686,7 +686,7 @@ show_sect_capab(int foo)
     register int x, first = 1, i, j;
     char *tmpstr;
 
-    for (x = 0; x < SCT_MAXDEF + 2; x++) {
+    for (x = 0; x <= SCT_MAXDEF; x++) {
 	if ((dchr[x].d_mnem == 0) || (dchr[x].d_prd == 0))
 	    continue;
 	if (first) {
diff --git a/src/lib/update/main.c b/src/lib/update/main.c
index 4592ef34..7961b920 100644
--- a/src/lib/update/main.c
+++ b/src/lib/update/main.c
@@ -112,7 +112,7 @@ update_main(void *unused)
     logerror("producing for countries...");
     for (x = 0; x < MAXNOC; x++) {
 	int y, z, sb = 0, sm = 0, pb = 0, pm = 0, lm = 0, lb = 0;
-	long p_sect[SCT_MAXDEF + 1][2];
+	long p_sect[SCT_MAXDEF+1][2];
 
 	memset(p_sect, 0, sizeof(p_sect));
 	mil_dbl_pay = 0;
@@ -126,8 +126,8 @@ update_main(void *unused)
 	}
 	np->nat_money += (int)(np->nat_reserve * money_res * etu);
 
-	for (y = 1; y < SCT_MAXDEF + 8; y++) {
-	    for (z = 0; z < SCT_MAXDEF + 8; z++) {
+	for (y = 1; y <= PRI_MAX; y++) {
+	    for (z = 0; z <= PRI_MAX; z++) {
 		if (np->nat_priorities[z] == y) {
 		    do_prod(z, etu, x, bp, p_sect,
 			    &sb, &sm, &pb, &pm, &lb, &lm);
diff --git a/src/util/files.c b/src/util/files.c
index 15c692eb..9faa4009 100644
--- a/src/util/files.c
+++ b/src/util/files.c
@@ -138,8 +138,8 @@ main(int argc, char *argv[])
     nat.nat_money = 123456789;
     nat.nat_cnum = 0;
     nat.nat_flags |= NF_FLASH;
-    for (x = 0; x < SCT_MAXDEF + 8; x++)
-	nat.nat_priorities[x] = -1;
+    for (i = 0; i <= PRI_MAX; i++)
+	nat.nat_priorities[i] = -1;
     putnat((&nat));
     printf("All praise to %s!\n", nat.nat_cnam);
     memset(&nat, 0, sizeof(nat));