diff --git a/core/base/inc/TStringLong.h b/core/base/inc/TStringLong.h
index 4ed9cdc80fd32..4e5705b53800b 100644
--- a/core/base/inc/TStringLong.h
+++ b/core/base/inc/TStringLong.h
@@ -27,7 +27,7 @@
 
 #include "TString.h"
 
-class TStringLong : public TString {
+class R__DEPRECATED(7, 00, "Use TString instead") TStringLong : public TString {
 
 public:
    TStringLong();                       // Null string
@@ -49,6 +49,6 @@ class TStringLong : public TString {
    Int_t    Sizeof() const override;
 
    ClassDefOverride(TStringLong,1)  //Long string class (more than 255 chars)
-} R__ALWAYS_SUGGEST_ALTERNATIVE("TString");
+};
 
 #endif