diff --git a/default.cfg b/default.cfg
index 210eeae..e50556a 100644
--- a/default.cfg
+++ b/default.cfg
@@ -2293,7 +2293,7 @@ align_var_def_thresh            = 1        # number
 align_var_def_gap               = 0        # unsigned number
 
 # Whether to align the colon in struct bit fields.
-align_var_def_colon             = false    # true/false
+align_var_def_colon             = true     # true/false
 
 # The gap for aligning the colon in struct bit fields.
 align_var_def_colon_gap         = 0        # unsigned number