diff --git a/components/vfs/manager.cpp b/components/vfs/manager.cpp
index d312ce9d84..1bf789402d 100644
--- a/components/vfs/manager.cpp
+++ b/components/vfs/manager.cpp
@@ -1,6 +1,7 @@
 #include "manager.hpp"
 
 #include <algorithm>
+#include <cassert>
 #include <stdexcept>
 
 #include <components/files/conversion.hpp>
@@ -44,6 +45,7 @@ namespace VFS
 
     Files::IStreamPtr Manager::getNormalized(std::string_view normalizedName) const
     {
+        assert(Path::isNormalized(normalizedName));
         const auto found = mIndex.find(normalizedName);
         if (found == mIndex.end())
             throw std::runtime_error("Resource '" + std::string(normalizedName) + "' not found");
diff --git a/components/vfs/pathutil.hpp b/components/vfs/pathutil.hpp
index 9bcc263842..0856bfffa2 100644
--- a/components/vfs/pathutil.hpp
+++ b/components/vfs/pathutil.hpp
@@ -15,6 +15,11 @@ namespace VFS::Path
         return c == '\\' ? '/' : Misc::StringUtils::toLower(c);
     }
 
+    inline constexpr bool isNormalized(std::string_view name)
+    {
+        return std::all_of(name.begin(), name.end(), [](char v) { return v == normalize(v); });
+    }
+
     inline void normalizeFilenameInPlace(std::string& name)
     {
         std::transform(name.begin(), name.end(), name.begin(), normalize);