diff --git a/dom/base/Document.cpp b/dom/base/Document.cpp
index 739073ba17db..666f055e2cec 100644
--- a/dom/base/Document.cpp
+++ b/dom/base/Document.cpp
@@ -9033,7 +9033,7 @@ void Document::SetDomain(const nsAString& aDomain, ErrorResult& rv) {
   MOZ_ALWAYS_SUCCEEDS(NodePrincipal()->SetDomain(newURI));
   MOZ_ALWAYS_SUCCEEDS(PartitionedPrincipal()->SetDomain(newURI));
   if (WindowGlobalChild* wgc = GetWindowGlobalChild()) {
-    wgc->SendSetDocumentDomain(newURI);
+    wgc->SendSetDocumentDomain(WrapNotNull(newURI));
   }
 }
 
diff --git a/dom/ipc/PWindowGlobal.ipdl b/dom/ipc/PWindowGlobal.ipdl
index 38ac45de4d11..a063852f56a7 100644
--- a/dom/ipc/PWindowGlobal.ipdl
+++ b/dom/ipc/PWindowGlobal.ipdl
@@ -109,7 +109,7 @@ parent:
   async InternalLoad(nsDocShellLoadState aLoadState);
 
   /// Update the URI of the document in this WindowGlobal.
-  [LazySend] async UpdateDocumentURI(nullable nsIURI aUri);
+  [LazySend] async UpdateDocumentURI(nsIURI aUri);
 
   // We expose frameAncestors to web-extensions and they extract URIs from the
   // principals collected. In order to be compatible with that API, we need to
@@ -196,7 +196,7 @@ parent:
    */
   async SetSingleChannelId(uint64_t? singleChannelId);
 
-  async SetDocumentDomain(nullable nsIURI aDomain);
+  async SetDocumentDomain(nsIURI aDomain);
 
   async Destroy();
 
diff --git a/dom/ipc/WindowGlobalChild.cpp b/dom/ipc/WindowGlobalChild.cpp
index 62dffe7549a3..ec2811f972ae 100644
--- a/dom/ipc/WindowGlobalChild.cpp
+++ b/dom/ipc/WindowGlobalChild.cpp
@@ -615,7 +615,7 @@ void WindowGlobalChild::SetDocumentURI(nsIURI* aDocumentURI) {
   }
 
   mDocumentURI = aDocumentURI;
-  SendUpdateDocumentURI(aDocumentURI);
+  SendUpdateDocumentURI(WrapNotNull(aDocumentURI));
 }
 
 void WindowGlobalChild::SetDocumentPrincipal(
diff --git a/dom/ipc/WindowGlobalParent.cpp b/dom/ipc/WindowGlobalParent.cpp
index 0dd7e869ae2a..2a02d2246c38 100644
--- a/dom/ipc/WindowGlobalParent.cpp
+++ b/dom/ipc/WindowGlobalParent.cpp
@@ -381,7 +381,7 @@ mozilla::ipc::IPCResult WindowGlobalParent::RecvInternalLoad(
   return IPC_OK();
 }
 
-IPCResult WindowGlobalParent::RecvUpdateDocumentURI(nsIURI* aURI) {
+IPCResult WindowGlobalParent::RecvUpdateDocumentURI(NotNull<nsIURI*> aURI) {
   // XXX(nika): Assert that the URI change was one which makes sense (either
   // about:blank -> a real URI, or a legal push/popstate URI change):
   if (StaticPrefs::dom_security_setdocumenturi()) {
@@ -1317,7 +1317,7 @@ mozilla::ipc::IPCResult WindowGlobalParent::RecvSetSingleChannelId(
 }
 
 mozilla::ipc::IPCResult WindowGlobalParent::RecvSetDocumentDomain(
-    nsIURI* aDomain) {
+    NotNull<nsIURI*> aDomain) {
   if (mSandboxFlags & SANDBOXED_DOMAIN) {
     // We're sandboxed; disallow setting domain
     return IPC_FAIL(this, "Sandbox disallows domain setting.");
@@ -1335,7 +1335,7 @@ mozilla::ipc::IPCResult WindowGlobalParent::RecvSetDocumentDomain(
     }
   }
 
-  if (!aDomain || !Document::IsValidDomain(uri, aDomain)) {
+  if (!Document::IsValidDomain(uri, aDomain)) {
     // Error: illegal domain
     return IPC_FAIL(
         this, "Setting domain that's not a suffix of existing domain value.");
diff --git a/dom/ipc/WindowGlobalParent.h b/dom/ipc/WindowGlobalParent.h
index e0f8091a7837..d801e8cfddc6 100644
--- a/dom/ipc/WindowGlobalParent.h
+++ b/dom/ipc/WindowGlobalParent.h
@@ -244,7 +244,7 @@ class WindowGlobalParent final : public WindowContext,
       const MaybeDiscarded<dom::BrowsingContext>& aTargetBC,
       nsDocShellLoadState* aLoadState, bool aSetNavigating);
   mozilla::ipc::IPCResult RecvInternalLoad(nsDocShellLoadState* aLoadState);
-  mozilla::ipc::IPCResult RecvUpdateDocumentURI(nsIURI* aURI);
+  mozilla::ipc::IPCResult RecvUpdateDocumentURI(NotNull<nsIURI*> aURI);
   mozilla::ipc::IPCResult RecvUpdateDocumentPrincipal(
       nsIPrincipal* aNewDocumentPrincipal,
       nsIPrincipal* aNewDocumentStoragePrincipal);
@@ -312,7 +312,7 @@ class WindowGlobalParent final : public WindowContext,
   mozilla::ipc::IPCResult RecvSetSingleChannelId(
       const Maybe<uint64_t>& aSingleChannelId);
 
-  mozilla::ipc::IPCResult RecvSetDocumentDomain(nsIURI* aDomain);
+  mozilla::ipc::IPCResult RecvSetDocumentDomain(NotNull<nsIURI*> aDomain);
 
   mozilla::ipc::IPCResult RecvReloadWithHttpsOnlyException();