diff --git a/test/regression_vars.tcl b/test/regression_vars.tcl
index 47e2ddd1..3928cec8 100644
--- a/test/regression_vars.tcl
+++ b/test/regression_vars.tcl
@@ -17,11 +17,7 @@
 # Regression variables.
 
 # Application program to run tests on.
-if { [regexp "CYGWIN" [exec uname -a]] } {
-  set app "sta.exe"
-} else {
-  set app "sta"
-}
+set app "sta"
 set sta_dir [file dirname $test_dir]
 set app_path [file join $sta_dir "app" $app]
 # Application options.