diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3ee83edaaf..9a81564a33 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,7 @@
 ### Bug fixes
 
 * [#345](https://github.com/rubocop-hq/rubocop-rails/issues/345): Fix error of `Rails/AfterCommitOverride` on `after_commit` with a lambda. ([@pocke][])
+* [#346](https://github.com/rubocop-hq/rubocop-rails/pull/346): Fix a false positive for `Rails/DynamicFindBy` when any of the arguments are splat argument. ([@koic][])
 
 ## 2.8.0 (2020-09-04)
 
diff --git a/lib/rubocop/cop/rails/dynamic_find_by.rb b/lib/rubocop/cop/rails/dynamic_find_by.rb
index 3c2e349b59..e86efd6d26 100644
--- a/lib/rubocop/cop/rails/dynamic_find_by.rb
+++ b/lib/rubocop/cop/rails/dynamic_find_by.rb
@@ -41,6 +41,7 @@ def on_send(node)
           method_name = node.method_name
           static_name = static_method_name(method_name)
           return unless static_name
+          return if node.arguments.any?(&:splat_type?)
 
           add_offense(node,
                       message: format(MSG, static_name: static_name,
diff --git a/spec/rubocop/cop/rails/dynamic_find_by_spec.rb b/spec/rubocop/cop/rails/dynamic_find_by_spec.rb
index 7866a49dad..d5655dc582 100644
--- a/spec/rubocop/cop/rails/dynamic_find_by_spec.rb
+++ b/spec/rubocop/cop/rails/dynamic_find_by_spec.rb
@@ -133,6 +133,14 @@
     expect_no_offenses('User.find_by(name: name)')
   end
 
+  it 'accepts splat argument' do
+    expect_no_offenses('User.find_by_scan(*args)')
+  end
+
+  it 'accepts any of the arguments are splat argument' do
+    expect_no_offenses('User.find_by_foo_and_bar(arg, *args)')
+  end
+
   it 'accepts method in whitelist' do
     expect_no_offenses(<<~RUBY)
       User.find_by_sql(["select * from users where name = ?", name])