diff --git a/lib/DiscIONFS.cpp b/lib/DiscIONFS.cpp
index ea09b5c..1c28499 100644
--- a/lib/DiscIONFS.cpp
+++ b/lib/DiscIONFS.cpp
@@ -68,7 +68,7 @@ class DiscIONFS : public IDiscIO {
       /* Validate file path format */
       using SignedSize = std::make_signed<SystemString::size_type>::type;
       const auto dotPos = SignedSize(fpin.rfind('.'));
-      const auto slashPos = SignedSize(fpin.rfind("/\\"));
+      const auto slashPos = SignedSize(fpin.find_last_of("/\\"));
       if (fpin.size() <= 4 || dotPos == -1 || dotPos <= slashPos ||
           fpin.compare(slashPos + 1, 4, "hif_") ||
           fpin.compare(dotPos, fpin.size() - dotPos, ".nfs")) {
diff --git a/lib/nod.cpp b/lib/nod.cpp
index abe7461..d679fab 100644
--- a/lib/nod.cpp
+++ b/lib/nod.cpp
@@ -35,7 +35,7 @@ std::unique_ptr<DiscBase> OpenDiscFromImage(SystemStringView path, bool& isWii)
 
   using SignedSize = std::make_signed<SystemString::size_type>::type;
   const auto dotPos = SignedSize(path.rfind('.'));
-  const auto slashPos = SignedSize(path.rfind("/\\"));
+  const auto slashPos = SignedSize(path.find_last_of("/\\"));
   if (magic == nod::SBig((uint32_t)'WBFS')) {
     discIO = NewDiscIOWBFS(path);
     isWii = true;