diff --git a/config.h.in b/config.h.in
index c7a088e3ce..7e557f9a25 100644
--- a/config.h.in
+++ b/config.h.in
@@ -248,12 +248,6 @@ int sigwait(const unsigned int *set, int *sig);
 /* Define if OpenSSL provides FIPS_mode() */
 #undef HAVE_FIPS_MODE
 
-/* Define to 1 if you have the `fseeko' function. */
-#undef HAVE_FSEEKO
-
-/* Define to 1 if you have the `ftello' function. */
-#undef HAVE_FTELLO
-
 /* Build with GeoIP support */
 #undef HAVE_GEOIP
 
diff --git a/configure b/configure
index ab7718d825..587e8ab98a 100755
--- a/configure
+++ b/configure
@@ -13535,20 +13535,6 @@ fi
 done
 
 
-# BSDI doesn't have ftello fseeko
-for ac_func in ftello fseeko
-do :
-  as_ac_var=`$as_echo "ac_cv_func_$ac_func" | $as_tr_sh`
-ac_fn_c_check_func "$LINENO" "$ac_func" "$as_ac_var"
-if eval test \"x\$"$as_ac_var"\" = x"yes"; then :
-  cat >>confdefs.h <<_ACEOF
-#define `$as_echo "HAVE_$ac_func" | $as_tr_cpp` 1
-_ACEOF
-
-fi
-done
-
-
 #
 # UnixWare 7.1.1 with the feature supplement to the UDK compiler
 # is reported to not support "static inline" (RT #1212).
diff --git a/configure.in b/configure.in
index 29b647f7c4..93c5473304 100644
--- a/configure.in
+++ b/configure.in
@@ -503,9 +503,6 @@ AC_CHECK_FUNCS(mmap)
 AC_CHECK_FUNCS(seteuid setresuid)
 AC_CHECK_FUNCS(setegid setresgid)
 
-# BSDI doesn't have ftello fseeko
-AC_CHECK_FUNCS(ftello fseeko)
-
 #
 # UnixWare 7.1.1 with the feature supplement to the UDK compiler
 # is reported to not support "static inline" (RT #1212).
diff --git a/lib/isc/unix/stdio.c b/lib/isc/unix/stdio.c
index 4008567097..9d8b45a374 100644
--- a/lib/isc/unix/stdio.c
+++ b/lib/isc/unix/stdio.c
@@ -48,11 +48,7 @@ isc_result_t
 isc_stdio_seek(FILE *f, off_t offset, int whence) {
 	int r;
 
-#ifdef HAVE_FSEEKO
 	r = fseeko(f, offset, whence);
-#else
-	r = fseek(f, offset, whence);
-#endif
 	if (r == 0)
 		return (ISC_R_SUCCESS);
 	else
@@ -65,11 +61,7 @@ isc_stdio_tell(FILE *f, off_t *offsetp) {
 
 	REQUIRE(offsetp != NULL);
 
-#ifdef HAVE_FTELLO
 	r = ftello(f);
-#else
-	r = ftell(f);
-#endif
 	if (r >= 0) {
 		*offsetp = r;
 		return (ISC_R_SUCCESS);