diff --git a/src/dnsmasq.h b/src/dnsmasq.h
index a416b60..e85ec2c 100644
--- a/src/dnsmasq.h
+++ b/src/dnsmasq.h
@@ -1252,6 +1252,7 @@
 char *canonicalise(char *in, int *nomem);
 unsigned char *do_rfc1035_name(unsigned char *p, char *sval, char *limit);
 void *safe_malloc(size_t size);
+void safe_strncpy(char *dest, const char *src, size_t size);
 void safe_pipe(int *fd, int read_noblock);
 void *whine_malloc(size_t size);
 int sa_len(union mysockaddr *addr);