diff --git a/core/net/mac/tsch/tsch-conf.h b/core/net/mac/tsch/tsch-conf.h
index 43e50d7c3..0cbce5913 100644
--- a/core/net/mac/tsch/tsch-conf.h
+++ b/core/net/mac/tsch/tsch-conf.h
@@ -179,7 +179,7 @@
 #ifdef TSCH_CONF_HW_FRAME_FILTERING
 #define TSCH_HW_FRAME_FILTERING TSCH_CONF_HW_FRAME_FILTERING
 #else /* TSCH_CONF_HW_FRAME_FILTERING */
-#define TSCH_HW_FRAME_FILTERING	1
+#define TSCH_HW_FRAME_FILTERING 1
 #endif /* TSCH_CONF_HW_FRAME_FILTERING */
 
 #endif /* __TSCH_CONF_H__ */