diff --git a/setup/Linux/oss/build/install.sh b/setup/Linux/oss/build/install.sh
index d47637c..7304451 100644
--- a/setup/Linux/oss/build/install.sh
+++ b/setup/Linux/oss/build/install.sh
@@ -198,7 +198,8 @@ fi
 
 if ! test -d /lib/modules/$UNAME/kernel/oss
 then
-  mkdir /lib/modules/$UNAME/kernel/oss
+  # --parents option required if extramodules does not exist.
+  mkdir --parents /lib/modules/$UNAME/kernel/oss
 fi
 
 if ! test -d /lib/modules/$UNAME/kernel/oss