diff --git a/build-data/reobf-mappings-patch.tiny b/build-data/reobf-mappings-patch.tiny
index 318872ceb8..1a967e0d8a 100644
--- a/build-data/reobf-mappings-patch.tiny
+++ b/build-data/reobf-mappings-patch.tiny
@@ -35,6 +35,9 @@ c	net/minecraft/world/effect/MobEffect	net/minecraft/world/effect/MobEffectList
 c	net/minecraft/world/level/storage/LevelStorageSource$LevelStorageAccess	net/minecraft/world/level/storage/Convertable$ConversionSession
 	m	(Lcom/mojang/serialization/DynamicOps;Lnet/minecraft/world/level/DataPackConfig;)Lnet/minecraft/world/level/storage/WorldData;	getDataTag	a
 
+c	net/minecraft/commands/arguments/MobEffectArgument	net/minecraft/commands/arguments/ArgumentMobEffect
+	m	(Lcom/mojang/brigadier/context/CommandContext;Ljava/lang/String;)Lnet.minecraft.world.effect/MobEffect;	getEffect	a
+
 # Paper moves method up from ServerLevel to Level
 c	net/minecraft/world/level/Level	net/minecraft/world/level/World
 	m	()Lnet/minecraft/core/BlockPos;	getSharedSpawnPos	getSpawn