diff --git a/src/MemoryX.h b/src/MemoryX.h
index 34cbe3c34bb5e17a9cfacaec6813e5bf72525ecb..cf1eeee8f104f8420c30318db8bbe4d4a92e001d 100644
--- a/src/MemoryX.h
+++ b/src/MemoryX.h
@@ -628,7 +628,7 @@ make_iterator_range( const Container &container )
 // For using std::unordered_map on wxString
 namespace std
 {
-   template<typename T> struct hash;
+//    template<typename T> struct hash;
    template<> struct hash< wxString > {
       size_t operator () (const wxString &str) const // noexcept
       {