diff --git a/crypto/cipher/aes_gcm_nss.c b/crypto/cipher/aes_gcm_nss.c
index 54547cd..ecbba64 100644
--- a/crypto/cipher/aes_gcm_nss.c
+++ b/crypto/cipher/aes_gcm_nss.c
@@ -284,6 +284,7 @@ static srtp_err_status_t srtp_aes_gcm_nss_do_crypto(void *cv,
 
     c->params.pIv = c->iv;
     c->params.ulIvLen = GCM_IV_LEN;
+    c->params.ulIvBits = 8 * GCM_IV_LEN;
     c->params.pAAD = c->aad;
     c->params.ulAADLen = c->aad_size;