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-rw-r--r--src/src/functions.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/src/functions.h b/src/src/functions.h
index 05386d105..cc4e22b2e 100644
--- a/src/src/functions.h
+++ b/src/src/functions.h
@@ -158,7 +158,7 @@ extern BOOL dns_is_secure(const dns_answer *);
extern int dns_lookup(dns_answer *, const uschar *, int, const uschar **);
extern void dns_pattern_init(void);
extern int dns_special_lookup(dns_answer *, const uschar *, int, const uschar **);
-extern dns_record *dns_next_rr(dns_answer *, dns_scan *, int);
+extern dns_record *dns_next_rr(const dns_answer *, dns_scan *, int);
extern uschar *dns_text_type(int);
extern void dscp_list_to_stream(FILE *);
extern BOOL dscp_lookup(const uschar *, int, int *, int *, int *);