diff --git a/client/render/AssetGenerator.cpp b/client/render/AssetGenerator.cpp
index c575c4dfd..4e88a106d 100644
--- a/client/render/AssetGenerator.cpp
+++ b/client/render/AssetGenerator.cpp
@@ -31,10 +31,6 @@ void AssetGenerator::createAdventureOptionsCleanBackground()
 	if(!CResourceHandler::get("local")->createResource(filename))
 		return;
 	ResourcePath savePath(filename, EResType::IMAGE);
-	
-	if(boost::filesystem::exists(*CResourceHandler::get("local")->getResourceName(savePath)) &&
-	   boost::filesystem::file_size(*CResourceHandler::get("local")->getResourceName(savePath)))
-		return;   
 
 	auto res = ImagePath::builtin("ADVOPTBK");
 	res.setOriginalResource(true);
@@ -53,6 +49,8 @@ void AssetGenerator::createAdventureOptionsCleanBackground()
 	std::shared_ptr<IImage> image = GH.renderHandler().createImage(canvas.getInternalSurface());
 
 	image->exportBitmap(*CResourceHandler::get("local")->getResourceName(savePath));
+
+	CResourceHandler::get("local")->removeResource(savePath); // remove resource -> may overridden by mod later
 }
 
 void AssetGenerator::createBigSpellBook()
@@ -62,10 +60,6 @@ void AssetGenerator::createBigSpellBook()
 	if(!CResourceHandler::get("local")->createResource(filename))
 		return;
 	ResourcePath savePath(filename, EResType::IMAGE);
-	
-	if(boost::filesystem::exists(*CResourceHandler::get("local")->getResourceName(savePath)) &&
-	   boost::filesystem::file_size(*CResourceHandler::get("local")->getResourceName(savePath)))
-		return;   
 
 	auto res = ImagePath::builtin("SpelBack");
 	res.setOriginalResource(true);
@@ -117,4 +111,6 @@ void AssetGenerator::createBigSpellBook()
 	std::shared_ptr<IImage> image = GH.renderHandler().createImage(canvas.getInternalSurface());
 
 	image->exportBitmap(*CResourceHandler::get("local")->getResourceName(savePath));
+
+	CResourceHandler::get("local")->removeResource(savePath); // remove resource -> may overridden by mod later
 }
diff --git a/client/render/AssetGenerator.h b/client/render/AssetGenerator.h
index 1fecab6f0..92b3ebef9 100644
--- a/client/render/AssetGenerator.h
+++ b/client/render/AssetGenerator.h
@@ -16,4 +16,4 @@ class AssetGenerator
 
 public:
     static void generate();
-};
\ No newline at end of file
+};
diff --git a/lib/filesystem/CFilesystemLoader.cpp b/lib/filesystem/CFilesystemLoader.cpp
index c877bffd4..3bc339898 100644
--- a/lib/filesystem/CFilesystemLoader.cpp
+++ b/lib/filesystem/CFilesystemLoader.cpp
@@ -108,6 +108,11 @@ bool CFilesystemLoader::createResource(const std::string & requestedFilename, bo
 	return true;
 }
 
+void CFilesystemLoader::removeResource(const ResourcePath & resourceName)
+{
+	fileList.erase(resourceName);
+}
+
 std::unordered_map<ResourcePath, boost::filesystem::path> CFilesystemLoader::listFiles(const std::string &mountPoint, size_t depth, bool initial) const
 {
 	static const EResType initArray[] = {
diff --git a/lib/filesystem/CFilesystemLoader.h b/lib/filesystem/CFilesystemLoader.h
index ec75c62a0..6eb21809c 100644
--- a/lib/filesystem/CFilesystemLoader.h
+++ b/lib/filesystem/CFilesystemLoader.h
@@ -38,6 +38,7 @@ public:
 	bool existsResource(const ResourcePath & resourceName) const override;
 	std::string getMountPoint() const override;
 	bool createResource(const std::string & filename, bool update = false) override;
+	void removeResource(const ResourcePath & resourceName) override;
 	std::optional<boost::filesystem::path> getResourceName(const ResourcePath & resourceName) const override;
 	void updateFilteredFiles(std::function<bool(const std::string &)> filter) const override;
 	std::unordered_set<ResourcePath> getFilteredFiles(std::function<bool(const ResourcePath &)> filter) const override;
diff --git a/lib/filesystem/ISimpleResourceLoader.h b/lib/filesystem/ISimpleResourceLoader.h
index 06b7c9a65..23e27b0e0 100644
--- a/lib/filesystem/ISimpleResourceLoader.h
+++ b/lib/filesystem/ISimpleResourceLoader.h
@@ -95,6 +95,11 @@ public:
 		return false;
 	}
 
+	/**
+	 * Remove resources from cached list.
+	 */
+	virtual void removeResource(const ResourcePath & resourceName) { };
+
 	/**
 	 * @brief Returns all loaders that have resource with such name
 	 *