diff --git a/NPLib/Tools/TAsciiFile.h b/NPLib/Tools/TAsciiFile.h
index 5604476704af387ea14cd8298060c57e0cb35d34..fb64f0dc218c5fe9e349794873672976c97c46b9 100644
--- a/NPLib/Tools/TAsciiFile.h
+++ b/NPLib/Tools/TAsciiFile.h
@@ -50,7 +50,7 @@ class TAsciiFile : public TNamed {
    void Print(const Option_t*) const {}; 
    void Print() const;
    void Print(UInt_t begin, UInt_t end) const;
-   bool IsEmpty () {if (fLines.size()!=0) return true;
+   bool IsEmpty () {if (fLines.size()==0) return true;
                     else return false ;}
 
    ClassDef(TAsciiFile, 1);	// Class TAsciiFile for storing ascii text