diff --git a/lib/mock_redis/hash_methods.rb b/lib/mock_redis/hash_methods.rb
index 9239830..e79a7a0 100644
--- a/lib/mock_redis/hash_methods.rb
+++ b/lib/mock_redis/hash_methods.rb
@@ -10,6 +10,11 @@ def hdel(key, *fields)
       with_hash_at(key) do |hash|
         orig_size = hash.size
         fields = Array(fields).flatten.map(&:to_s)
+
+        if fields.empty?
+          raise Redis::CommandError, "ERR wrong number of arguments for 'hdel' command"
+        end
+
         hash.delete_if { |k, _v| fields.include?(k) }
         orig_size - hash.size
       end
diff --git a/spec/commands/hdel_spec.rb b/spec/commands/hdel_spec.rb
index d015569..418a6ec 100644
--- a/spec/commands/hdel_spec.rb
+++ b/spec/commands/hdel_spec.rb
@@ -66,5 +66,12 @@
     @redises.get(@key).should be_nil
   end
 
+  it 'raises error if an empty array is passed' do
+    expect { @redises.hdel(@key, []) }.to raise_error(
+      Redis::CommandError,
+      "ERR wrong number of arguments for 'hdel' command"
+    )
+  end
+
   it_should_behave_like 'a hash-only command'
 end