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-rw-r--r--crawl-ref/source/monstuff.cc1
1 files changed, 1 insertions, 0 deletions
diff --git a/crawl-ref/source/monstuff.cc b/crawl-ref/source/monstuff.cc
index 5e10ddbf67..c23d93098f 100644
--- a/crawl-ref/source/monstuff.cc
+++ b/crawl-ref/source/monstuff.cc
@@ -1431,6 +1431,7 @@ static bool _valid_morph( monsters *monster, int new_mclass )
// Various inappropriate polymorph targets.
if (mons_class_holiness( new_mclass ) != mons_holiness( monster )
+ || mons_class_flag( new_mclass, M_UNIQUE) // no uniques
|| mons_class_flag( new_mclass, M_NO_EXP_GAIN ) // not helpless
|| new_mclass == mons_species( monster->type ) // must be different
|| new_mclass == MONS_PROGRAM_BUG