diff --git a/lib/hx509/version-script.map b/lib/hx509/version-script.map
index 1e9569a64..fe3abc7d9 100644
--- a/lib/hx509/version-script.map
+++ b/lib/hx509/version-script.map
@@ -182,6 +182,7 @@ HEIMDAL_X509_1.0 {
 		hx509_verify_set_strict_rfc3280_verification;
 		hx509_verify_set_time;
 		hx509_verify_signature;
+		hx509_pem_write;
 	local:
 		*;
 };