diff --git a/configure.ac b/configure.ac
index d42edd8..f66af10 100644
--- a/configure.ac
+++ b/configure.ac
@@ -290,7 +290,7 @@ AC_HEADER_TIME
 
 dnl Checks for library functions.
 AC_CHECK_FUNCS([gettimeofday vasprintf fcntl clock_gettime strtok_r strsep])
-AC_CHECK_FUNCS([getnameinfo strlcpy inet_ntop inet_pton signal sigaction strtoll inet_aton pipe eventfd sendfile mmap splice arc4random arc4random_buf issetugid geteuid getegid getprotobynumber setenv unsetenv putenv sysctl])
+AC_CHECK_FUNCS([getnameinfo strlcpy inet_ntop inet_pton signal sigaction strtoll inet_aton pipe eventfd sendfile mmap splice arc4random arc4random_addrandom arc4random_buf issetugid geteuid getegid getprotobynumber setenv unsetenv putenv sysctl])
 AC_CHECK_FUNCS([umask])
 
 AC_CACHE_CHECK(
diff --git a/evutil_rand.c b/evutil_rand.c
index 284341c..255e940 100644
--- a/evutil_rand.c
+++ b/evutil_rand.c
@@ -171,10 +171,11 @@ evutil_secure_rng_get_bytes(void *buf, size_t n)
 	ev_arc4random_buf(buf, n);
 }
 
+#ifdef HAVE_ARC4RANDOM_ADDRANDOM
 void
 evutil_secure_rng_add_bytes(const char *buf, size_t n)
 {
 	arc4random_addrandom((unsigned char*)buf,
 	    n>(size_t)INT_MAX ? INT_MAX : (int)n);
 }
-
+#endif
diff --git a/include/event2/util.h b/include/event2/util.h
index dde9113..e55c8b4 100644
--- a/include/event2/util.h
+++ b/include/event2/util.h
@@ -690,6 +690,7 @@ int evutil_secure_rng_init(void);
  */
 int evutil_secure_rng_set_urandom_device_file(char *fname);
 
+#ifdef HAVE_ARC4RANDOM_ADDRANDOM
 /** Seed the random number generator with extra random bytes.
 
     You should almost never need to call this function; it should be
@@ -705,6 +706,7 @@ int evutil_secure_rng_set_urandom_device_file(char *fname);
     @param datlen the number of bytes to read from datlen
  */
 void evutil_secure_rng_add_bytes(const char *dat, size_t datlen);
+#endif
 
 #ifdef __cplusplus
 }