diff --git a/tools/install.sh b/tools/install.sh
index fb6973dbc..a6538f9d7 100755
--- a/tools/install.sh
+++ b/tools/install.sh
@@ -273,7 +273,7 @@ setup_ohmyzsh() {
   }
 
   ostype=$(uname)
-  if [ -z "${ostype%CYGWIN*}" ] && git --version | grep -q msysgit; then
+  if [ -z "${ostype%CYGWIN*}" ] && git --version | grep -Eq 'msysgit|windows'; then
     fmt_error "Windows/MSYS Git is not supported on Cygwin"
     fmt_error "Make sure the Cygwin git package is installed and is first on the \$PATH"
     exit 1