diff --git a/scripts/make_common.sh b/scripts/make_common.sh
index 285f129b..26cba3fb 100755
--- a/scripts/make_common.sh
+++ b/scripts/make_common.sh
@@ -5,7 +5,7 @@ BUILD_CLEAN=$2
 IS_MINGW=$3
 IS_WIN32=$4
 
-if [[ -z "${BUILD_TYPE}" ]]; then
+if [ "${BUILD_TYPE}" == "" ]; then
   BUILD_TYPE=Release
 fi
 
diff --git a/scripts/make_win32.cmd b/scripts/make_win32.cmd
index 0d4273f3..ec1b25a6 100644
--- a/scripts/make_win32.cmd
+++ b/scripts/make_win32.cmd
@@ -1,5 +1,5 @@
 @echo off
 
 pushd "%~dp0%.."
-mingw64 scripts/make_common.sh %1 "%2" 0 1
+mingw64 scripts/make_common.sh "%1" "%2" 0 1
 popd