diff --git a/uncrustify-riot.cfg b/uncrustify-riot.cfg
index 7fb7d9c29b..191acd8e0c 100644
--- a/uncrustify-riot.cfg
+++ b/uncrustify-riot.cfg
@@ -62,7 +62,7 @@ sp_inside_sparen    = remove    # remove spaces inside parens for if, while and
 # Aligning stuff
 #
 
-align_with_tabs     = TRUE      # use tabs to align
+align_with_tabs     = FALSE     # use tabs to align
 align_on_tabstop    = TRUE      # align on tabstops
 align_enum_equ_span = 4         # '=' in enum definition
 align_struct_init_span  = 3     # align stuff in a structure init '= { }'