diff --git a/src/bin/pg_upgrade/test.sh b/src/bin/pg_upgrade/test.sh
index a80501895b..45ccd8fa66 100644
--- a/src/bin/pg_upgrade/test.sh
+++ b/src/bin/pg_upgrade/test.sh
@@ -34,7 +34,7 @@ standard_initdb() {
 testhost=`uname -s`
 
 case $testhost in
-	MINGW*)
+	MINGW*|MSYS*)
 		LISTEN_ADDRESSES="localhost"
 		PGHOST=localhost
 		;;