diff --git a/src/reports.c b/src/reports.c
index 101eb75e8..e0d4cff37 100644
--- a/src/reports.c
+++ b/src/reports.c
@@ -1419,7 +1419,7 @@ void prepare_seen(faction *f)
     link_seen(f->seen, f->first, f->last);
 }
 
-void prepare_report(struct report_context *ctx, faction *f)
+static void prepare_report(struct report_context *ctx, faction *f)
 {
     assert(f->seen);
     prepare_seen(f);
diff --git a/src/reports.h b/src/reports.h
index f9bc9b495..584fe7d4a 100644
--- a/src/reports.h
+++ b/src/reports.h
@@ -57,7 +57,6 @@ extern "C" {
         const struct unit *u, unsigned int indent, int mode);
 
     void prepare_seen(struct faction *f);
-    void prepare_report(struct report_context *ctx, struct faction *f);
     int reports(void);
     int write_reports(struct faction *f, time_t ltime);
     int init_reports(void);