diff --git a/src/Buffer.cpp b/src/Buffer.cpp
index c902db790a..7f5ebcb17f 100644
--- a/src/Buffer.cpp
+++ b/src/Buffer.cpp
@@ -515,7 +515,7 @@ void Buffer::cloneWithChildren(BufferMap & bufmap, CloneList * clones) const
 
 	// The clone needs its own DocumentClass, since running updateBuffer() will
 	// modify it, and we would otherwise be sharing it with the original Buffer.
-	buffer_clone->params().makeDocumentClass();
+	buffer_clone->params().makeDocumentClass(true);
 	ErrorList el;
 	cap::switchBetweenClasses(
 			params().documentClassPtr(), buffer_clone->params().documentClassPtr(),
@@ -563,7 +563,7 @@ Buffer * Buffer::cloneBufferOnly() const {
 
 	// The clone needs its own DocumentClass, since running updateBuffer() will
 	// modify it, and we would otherwise be sharing it with the original Buffer.
-	buffer_clone->params().makeDocumentClass();
+	buffer_clone->params().makeDocumentClass(true);
 	ErrorList el;
 	cap::switchBetweenClasses(
 			params().documentClassPtr(), buffer_clone->params().documentClassPtr(),
diff --git a/src/BufferParams.cpp b/src/BufferParams.cpp
index 4aaf5457f2..8c61d5a864 100644
--- a/src/BufferParams.cpp
+++ b/src/BufferParams.cpp
@@ -2044,12 +2044,12 @@ LayoutFileIndex const & BufferParams::baseClassID() const
 }
 
 
-void BufferParams::makeDocumentClass()
+void BufferParams::makeDocumentClass(bool const clone)
 {
 	if (!baseClass())
 		return;
 
-	doc_class_ = &(DocumentClassBundle::get().makeDocumentClass(*baseClass(), layout_modules_));
+	doc_class_ = &(DocumentClassBundle::get().makeDocumentClass(*baseClass(), layout_modules_, clone));
 
 	if (!local_layout.empty()) {
 		if (!doc_class_->read(local_layout, TextClass::MODULE)) {
diff --git a/src/BufferParams.h b/src/BufferParams.h
index bb29f01d52..0c44b7f369 100644
--- a/src/BufferParams.h
+++ b/src/BufferParams.h
@@ -123,7 +123,7 @@ public:
 	bool setBaseClass(std::string const & classname);
 	/// Adds the module information to the baseClass information to
 	/// create our local DocumentClass.
-	void makeDocumentClass();
+	void makeDocumentClass(bool const clone = false);
 	/// Returns the DocumentClass currently in use: the BaseClass as modified
 	/// by modules.
 	DocumentClass const & documentClass() const;
diff --git a/src/TextClass.cpp b/src/TextClass.cpp
index a15f8bf6a4..2a933de796 100644
--- a/src/TextClass.cpp
+++ b/src/TextClass.cpp
@@ -1313,7 +1313,7 @@ DocumentClassBundle & DocumentClassBundle::get()
 
 
 DocumentClass & DocumentClassBundle::makeDocumentClass(
-		LayoutFile const & baseClass, LayoutModuleList const & modlist)
+		LayoutFile const & baseClass, LayoutModuleList const & modlist, bool const clone)
 {
 	DocumentClass & doc_class = newClass(baseClass);
 	LayoutModuleList::const_iterator it = modlist.begin();
@@ -1327,10 +1327,11 @@ DocumentClass & DocumentClassBundle::makeDocumentClass(
 						"this document but has not been found in the list of\n"
 						"available modules. If you recently installed it, you\n"
 						"probably need to reconfigure LyX.\n"), from_utf8(modName));
-			frontend::Alert::warning(_("Module not available"), msg);
+			if (!clone)
+				frontend::Alert::warning(_("Module not available"), msg);
 			continue;
 		}
-		if (!lm->isAvailable()) {
+		if (!lm->isAvailable() && !clone) {
 			docstring const prereqs = from_utf8(getStringFromVector(lm->prerequisites(), "\n\t"));
 			docstring const msg =
 				bformat(_("The module %1$s requires a package that is not\n"
@@ -1343,7 +1344,7 @@ DocumentClass & DocumentClassBundle::makeDocumentClass(
 			frontend::Alert::warning(_("Package not available"), msg, true);
 		}
 		FileName layout_file = libFileSearch("layouts", lm->getFilename());
-		if (!doc_class.read(layout_file, TextClass::MODULE)) {
+		if (!doc_class.read(layout_file, TextClass::MODULE) && !clone) {
 			docstring const msg =
 						bformat(_("Error reading module %1$s\n"), from_utf8(modName));
 			frontend::Alert::warning(_("Read Error"), msg);
diff --git a/src/TextClass.h b/src/TextClass.h
index dc30062922..85f1fb4876 100644
--- a/src/TextClass.h
+++ b/src/TextClass.h
@@ -467,7 +467,8 @@ public:
 	/// \return A new DocumentClass based on baseClass, with info added
 	/// from the modules in modlist.
 	DocumentClass & makeDocumentClass(LayoutFile const & baseClass, 
-			LayoutModuleList const & modlist);
+			LayoutModuleList const & modlist,
+			bool const clone = false);
 private:
 	/// control instantiation
 	DocumentClassBundle() {}
diff --git a/src/frontends/qt4/GuiDocument.cpp b/src/frontends/qt4/GuiDocument.cpp
index 315c32162c..a678755f8d 100644
--- a/src/frontends/qt4/GuiDocument.cpp
+++ b/src/frontends/qt4/GuiDocument.cpp
@@ -2151,7 +2151,7 @@ void GuiDocument::updateDefaultFormat()
 	if (idx >= 0) {
 		string const classname = classes_model_.getIDString(idx);
 		param_copy.setBaseClass(classname);
-		param_copy.makeDocumentClass();
+		param_copy.makeDocumentClass(true);
 	}
 	outputModule->defaultFormatCO->blockSignals(true);
 	outputModule->defaultFormatCO->clear();
diff --git a/status.20x b/status.20x
index 79e52dc048..bdaeb76692 100644
--- a/status.20x
+++ b/status.20x
@@ -77,6 +77,8 @@ What's new
 
 - Fix the missing dynamic menus in general and restore correctly from fullscreen.
 
+- Prevent recurrent pop-up of "missing module requirements" warning (bug 8864).
+
 
 * DOCUMENTATION AND LOCALIZATION