diff --git a/src/main/java/org/bukkit/craftbukkit/CraftServer.java b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
index 0217535a2..7366b93eb 100644
--- a/src/main/java/org/bukkit/craftbukkit/CraftServer.java
+++ b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
@@ -2488,7 +2488,7 @@ public final class CraftServer implements Server {
                 return itemTags.getTags().map(pair -> (org.bukkit.Tag<T>) new CraftItemTag(itemTags, pair.key())).collect(ImmutableList.toImmutableList());
             }
             case org.bukkit.Tag.REGISTRY_FLUIDS -> {
-                Preconditions.checkArgument(clazz == org.bukkit.Material.class, "Fluid namespace (%s) must have fluid type", clazz.getName());
+                Preconditions.checkArgument(clazz == org.bukkit.Fluid.class, "Fluid namespace (%s) must have fluid type", clazz.getName());
                 IRegistry<FluidType> fluidTags = BuiltInRegistries.FLUID;
                 return fluidTags.getTags().map(pair -> (org.bukkit.Tag<T>) new CraftFluidTag(fluidTags, pair.key())).collect(ImmutableList.toImmutableList());
             }