diff --git a/mysql-test/lib/My/Find.pm b/mysql-test/lib/My/Find.pm
index 4a1fff0fdfc..36a08dd6b58 100644
--- a/mysql-test/lib/My/Find.pm
+++ b/mysql-test/lib/My/Find.pm
@@ -29,7 +29,7 @@ our @EXPORT= qw(my_find_bin my_find_dir);
 
 our $vs_config_dir;
 
-my $is_win= ($^O eq "MSWin32" or $^O eq "Win32");
+my $is_win= ($^O eq "MSWin32" or $^O eq "cygwin");
 my $bin_extension= ".exe" if $is_win;
 
 #