diff --git a/wsjtx.iss b/wsjtx.iss
index 1fdcbdb64..5882cf5cb 100644
--- a/wsjtx.iss
+++ b/wsjtx.iss
@@ -12,7 +12,7 @@ Source: "c:\Users\joe\wsjt\wsjtx_install\rigctl.exe";        DestDir: "{app}"
 Source: "c:\Users\joe\wsjt\wsjtx_install\wsjt.ico";          DestDir: "{app}"
 Source: "c:\Users\joe\wsjt\wsjtx_install\afmhot.dat";        DestDir: "{app}";
 Source: "c:\Users\joe\wsjt\wsjtx_install\blue.dat";          DestDir: "{app}";
-Source: "c:\Users\joe\wsjt\wsjtx_install\CALL3.TXT";         DestDir: "{app}";
+Source: "c:\Users\joe\wsjt\wsjtx_install\CALL3.TXT";         DestDir: "{app}";  Flags: onlyifdoesntexist
 Source: "c:\Users\joe\wsjt\wsjtx\WSJT-X_Users_Guide.pdf";    DestDir: "{app}";
 Source: "c:\Users\joe\wsjt\QtSupport\*.dll";                 DestDir: "{app}";  Flags: onlyifdoesntexist
 Source: "c:\Users\joe\wsjt\wsjtx_install\save\Samples\130228_2158.wav";   DestDir: "{app}\save\Samples";