diff --git a/src/lib/commands/bomb.c b/src/lib/commands/bomb.c
index 579d74fa..0fc54442 100644
--- a/src/lib/commands/bomb.c
+++ b/src/lib/commands/bomb.c
@@ -929,7 +929,6 @@ static int
 pinflak_planedamage(struct plnstr *pp, struct plchrstr *pcp, natid from,
 		    int flak)
 {
-    extern double flakscale;
     int disp;
     s_char dmess[255];
     int eff;
diff --git a/src/lib/subs/aircombat.c b/src/lib/subs/aircombat.c
index f7f2d3c4..ad128e76 100644
--- a/src/lib/subs/aircombat.c
+++ b/src/lib/subs/aircombat.c
@@ -968,7 +968,6 @@ ac_landflak(struct emp_qelem *list, coord x, coord y)
 void
 ac_fireflak(struct emp_qelem *list, natid from, natid other, int guns)
 {
-    extern double flakscale;
     register struct plnstr *pp;
     struct plist *plp;
     int n;
diff --git a/src/util/files.c b/src/util/files.c
index 5c71a32b..5f5878ba 100644
--- a/src/util/files.c
+++ b/src/util/files.c
@@ -73,7 +73,6 @@ int
 main(int argc, char *argv[])
 {
     extern s_char *timestampfil;
-    extern s_char *infodir;
     extern s_char *commfil;
     s_char buf[255];
     s_char tbuf[512];