diff --git a/src/monster.cpp b/src/monster.cpp
index 8fd559d401584..5026c65a2bea0 100644
--- a/src/monster.cpp
+++ b/src/monster.cpp
@@ -88,6 +88,8 @@ static const efftype_id effect_run( "run" );
 static const efftype_id effect_stunned( "stunned" );
 static const efftype_id effect_supercharged( "supercharged" );
 static const efftype_id effect_tied( "tied" );
+static const efftype_id effect_venom_dmg( "venom_dmg" );
+static const efftype_id effect_venom_weaken( "venom_weaken" );
 static const efftype_id effect_webbed( "webbed" );
 
 static const itype_id itype_corpse( "corpse" );
@@ -1289,6 +1291,8 @@ bool monster::is_immune_effect( const efftype_id &effect ) const
 
     if( effect == effect_paralyzepoison ||
         effect == effect_badpoison ||
+        effect == effect_venom_dmg ||
+        effect == effect_venom_weaken ||
         effect == effect_poison ) {
         return !has_flag( MF_WARM ) ||
                ( !made_of( material_id( "flesh" ) ) && !made_of( material_id( "iflesh" ) ) );