diff --git a/security/nss/lib/smime/smime.def b/security/nss/lib/smime/smime.def
index 78c79501b3f3..15c302a6e31f 100644
--- a/security/nss/lib/smime/smime.def
+++ b/security/nss/lib/smime/smime.def
@@ -247,3 +247,10 @@ SEC_PKCS7EncoderAbort;
 ;+    local:
 ;+       *;
 ;+};
+;+NSS_3.9.3 {   # NSS 3.9.3 release
+;+    global:
+CERT_ConvertAndDecodeCertificate;
+SEC_PKCS7EncodeItem;
+;+    local:
+;+       *;
+;+};