diff --git a/tests/pkg_openwsn/Makefile b/tests/pkg_openwsn/Makefile
index 206a729f61..de1b6a9053 100644
--- a/tests/pkg_openwsn/Makefile
+++ b/tests/pkg_openwsn/Makefile
@@ -46,7 +46,7 @@ USEMODULE += openwsn_6lo_fragmentation
 ## Enable link layer security
 # USEMODULE += openwsn_iee802154e_security
 ## Enable MSF dynamic slot allocation
-#  USEMODULE += openwsn_adaptive_msf
+# USEMODULE += openwsn_adaptive_msf
 
 ## Optional Module, but required for root nodes
 # USEMODULE += openwsn_serial