diff --git a/moo/lib/fmtout.c b/moo/lib/fmtout.c
index 8b6ef52..39a2562 100644
--- a/moo/lib/fmtout.c
+++ b/moo/lib/fmtout.c
@@ -670,6 +670,12 @@ moo_ooi_t moo_logbfmt (moo_t* moo, moo_bitmask_t mask, const moo_bch_t* fmt, ...
 		 * it'll get turned back on */
 		mask |= (moo->log.default_type_mask & MOO_LOG_ALL_TYPES);
 	}
+	else if (!(mask & MOO_LOG_ALL_TYPES)) 
+	{
+		/* no type is set in the given mask and no default type is set.
+		 * make it UNTYPED. */
+		mask |= MOO_LOG_UNTYPED;
+	}
 
 	fo.mask = mask;
 	fo.putch = put_ooch;
@@ -698,6 +704,10 @@ moo_ooi_t moo_logufmt (moo_t* moo, moo_bitmask_t mask, const moo_uch_t* fmt, ...
 		mask &= ~MOO_LOG_UNTYPED;
 		mask |= (moo->log.default_type_mask & MOO_LOG_ALL_TYPES);
 	}
+	else if (!(mask & MOO_LOG_ALL_TYPES)) 
+	{
+		mask |= MOO_LOG_UNTYPED;
+	}
 
 	fo.mask = mask;
 	fo.putch = put_ooch;