diff --git a/thirdparty/configure-linux-native-deps.sh b/thirdparty/configure-linux-native-deps.sh
index 132e601dc7..0d3de1bf96 100755
--- a/thirdparty/configure-linux-native-deps.sh
+++ b/thirdparty/configure-linux-native-deps.sh
@@ -2,7 +2,7 @@
 # Use Linux system dependencies where possible, but take into account different .so names.
 
 os="$(uname -s)"
-if [ "$os" == 'Linux' ] || [ "$os" == 'FreeBSD' ]; then
+if [ "$os" = 'Linux' ] || [ "$os" = 'FreeBSD' ]; then
 	locations="/lib /lib64 /usr/lib /usr/lib64 /usr/lib/i386-linux-gnu /usr/lib/x86_64-linux-gnu /usr/local/lib /opt/lib"
 	sonames="liblua.so.5.1.5 liblua5.1.so.5.1 liblua5.1.so.0 liblua.so.5.1 liblua-5.1.so liblua5.1.so"