diff --git a/libexec/tfenv-install b/libexec/tfenv-install
index 15ab531..9b7d69a 100755
--- a/libexec/tfenv-install
+++ b/libexec/tfenv-install
@@ -89,10 +89,10 @@ case "$(uname -s)" in
   MINGW64*)
     kernel="windows";
     ;;
-  MSYS_NT*)
+  MSYS*NT*)
     kernel="windows";
     ;;
-  CYGWIN_NT*)
+  CYGWIN*NT*)
     kernel="windows";
     ;;
   FreeBSD*)