diff --git a/include/xdump.h b/include/xdump.h
index 9c88a833..e0fc42d8 100644
--- a/include/xdump.h
+++ b/include/xdump.h
@@ -43,7 +43,8 @@ struct xdstr {
     natid cnum;			/* dump for this country */
     int divine;			/* is this a deity dump? */
     int human;			/* dump human-readable format */
-    void (*pr)(char *fmt, ...);	/* callback for printing dump */
+    void (*pr)(char *fmt, ...)	/* callback for printing dump */
+	ATTRIBUTE((format (printf, 1, 2)));
 };
 
 struct xdstr *xdinit(struct xdstr *, natid, int, void (*)(char *, ...));
diff --git a/src/lib/empthread/ntthread.c b/src/lib/empthread/ntthread.c
index c642af06..565a8d1a 100644
--- a/src/lib/empthread/ntthread.c
+++ b/src/lib/empthread/ntthread.c
@@ -172,6 +172,7 @@ static void **ppvUserData;
 /* Global flags.  From empth_init parameter. */
 static int global_flags;
 
+static void loc_debug(const char *, ...) ATTRIBUTE((format(printf, 1, 2)));
 
 /************************
  * loc_debug
diff --git a/src/lib/subs/journal.c b/src/lib/subs/journal.c
index 7f450524..0c95115e 100644
--- a/src/lib/subs/journal.c
+++ b/src/lib/subs/journal.c
@@ -64,6 +64,9 @@
 static char journal_fname[] = "journal.log";
 static FILE *journal;
 
+static void journal_entry(char *fmt, ...)
+    ATTRIBUTE((format (printf, 1, 2)));
+
 static FILE *
 journal_open(void)
 {
diff --git a/src/util/empdump.c b/src/util/empdump.c
index 3b14a7bd..ae0a589f 100644
--- a/src/util/empdump.c
+++ b/src/util/empdump.c
@@ -45,7 +45,8 @@
 #include "version.h"
 #include "xdump.h"
 
-static void exit_bad_arg(char *, ...) ATTRIBUTE((noreturn));
+static void exit_bad_arg(char *, ...)
+    ATTRIBUTE((noreturn, format (printf, 1, 2)));
 static void dump_table(int, int);
 static void pln_fixup(void);
 static void lnd_fixup(void);