diff --git a/dom/crypto/WebCryptoTask.cpp b/dom/crypto/WebCryptoTask.cpp
--- a/dom/crypto/WebCryptoTask.cpp
+++ b/dom/crypto/WebCryptoTask.cpp
@@ -603,6 +603,7 @@
       case CKM_AES_GCM:
         gcmParams.pIv = mIv.Elements();
         gcmParams.ulIvLen = mIv.Length();
+        gcmParams.ulIvBits = gcmParams.ulIvLen * 8;
         gcmParams.pAAD = mAad.Elements();
         gcmParams.ulAADLen = mAad.Length();
         gcmParams.ulTagBits = mTagLength;
diff --git a/netwerk/srtp/src/crypto/cipher/aes_gcm_nss.c b/netwerk/srtp/src/crypto/cipher/aes_gcm_nss.c
--- a/netwerk/srtp/src/crypto/cipher/aes_gcm_nss.c
+++ b/netwerk/srtp/src/crypto/cipher/aes_gcm_nss.c
@@ -271,6 +271,7 @@
 
     c->params.pIv = c->iv;
     c->params.ulIvLen = GCM_IV_LEN;
+    c->params.ulIvBits = GCM_IV_LEN * 8;
     c->params.pAAD = c->aad;
     c->params.ulAADLen = c->aad_size;
 
diff --git a/security/manager/ssl/OSKeyStore.cpp b/security/manager/ssl/OSKeyStore.cpp
--- a/security/manager/ssl/OSKeyStore.cpp
+++ b/security/manager/ssl/OSKeyStore.cpp
@@ -663,6 +663,7 @@
   CK_GCM_PARAMS gcm_params;
   gcm_params.pIv = const_cast<unsigned char*>(ivp);
   gcm_params.ulIvLen = mIVLength;
+  gcm_params.ulIvBits = gcm_params.ulIvLen * 8;
   gcm_params.ulTagBits = 128;
   gcm_params.pAAD = nullptr;
   gcm_params.ulAADLen = 0;