diff --git a/startup/EpicsHostArch.pl b/startup/EpicsHostArch.pl
index 942d55940..e6babf6d3 100755
--- a/startup/EpicsHostArch.pl
+++ b/startup/EpicsHostArch.pl
@@ -31,7 +31,10 @@ sub GetEpicsHostArch { # no args
     } elsif ($arch =~ m/arm-linux/)     { return "linux-arm";
     } elsif ($arch =~ m/MSWin32-x86/)   { return "win32-x86";
     } elsif ($arch =~ m/MSWin32-x64/)   { return "windows-x64";
-    } elsif ($arch =~ m/cygwin/)        { return "cygwin-x86";
+    } elsif ($arch =~ m/cygwin/)        {
+            my($kernel, $hostname, $release, $version, $cpu) = POSIX::uname();
+            if ($cpu =~ m/x86_64/)      { return "cygwin-x86_64";  }
+	    return "cygwin-x86";
     } elsif ($arch =~ m/darwin/)        {
             my($kernel, $hostname, $release, $version, $cpu) = POSIX::uname();
             if ($cpu =~ m/Power Macintosh/) { return "darwin-ppc";  }