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-rw-r--r--crawl-ref/source/mgrow.cc4
1 files changed, 4 insertions, 0 deletions
diff --git a/crawl-ref/source/mgrow.cc b/crawl-ref/source/mgrow.cc
index e2a2548c8a..eb79932e05 100644
--- a/crawl-ref/source/mgrow.cc
+++ b/crawl-ref/source/mgrow.cc
@@ -210,6 +210,10 @@ bool monsters::gain_exp(int exp)
if (holiness() != MH_NATURAL)
return (false);
+ // Only monsters that you can gain XP from can level-up.
+ if (mons_class_flag(type, M_NO_EXP_GAIN))
+ return (false);
+
// Avoid wrap-around.
if (experience + exp < experience)
return (false);