diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2f41d4c..b1c82ea 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,10 @@
 ### Development
 [Full Changelog](https://github.com/rspec/rspec-activemodel-mocks/compare/v1.2.0...main)
 
+Bug fixes:
+
+* Fix `===` to work with multiple mocks. (@bquorning, #61)
+
 ### 1.2.0 / 2023-12-10
 [Full Changelog](https://github.com/rspec/rspec-activemodel-mocks/compare/v1.1.0...v1.2.0)
 
diff --git a/lib/rspec/active_model/mocks/mocks.rb b/lib/rspec/active_model/mocks/mocks.rb
index 6c42f53..fa70939 100644
--- a/lib/rspec/active_model/mocks/mocks.rb
+++ b/lib/rspec/active_model/mocks/mocks.rb
@@ -94,6 +94,8 @@ def association(association_name)
     #   * A String representing a Class that extends ActiveModel::Naming
     #   * A Class that extends ActiveModel::Naming
     def mock_model(string_or_model_class, stubs={})
+      @__rspec_active_model_mocks ||= Hash.new { |h, k| h[k] = [] }
+
       if String === string_or_model_class
         if Object.const_defined?(string_or_model_class)
           model_class = Object.const_get(string_or_model_class)
@@ -137,9 +139,10 @@ def self.param_delimiter; "-"; end
       double("#{model_class.name}_#{stubs[:id]}", stubs).tap do |m|
         if model_class.method(:===).owner == Module && !stubs.key?(:===)
           allow(model_class).to receive(:===).and_wrap_original do |original, other|
-            m === other || original.call(other)
+            @__rspec_active_model_mocks[model_class].include?(other) || original.call(other)
           end
         end
+        @__rspec_active_model_mocks[model_class] << m
         msingleton = class << m; self; end
         msingleton.class_eval do
           include ActiveModelInstanceMethods
diff --git a/spec/rspec/active_model/mocks/mock_model_spec.rb b/spec/rspec/active_model/mocks/mock_model_spec.rb
index 1603f6b..d936aa0 100644
--- a/spec/rspec/active_model/mocks/mock_model_spec.rb
+++ b/spec/rspec/active_model/mocks/mock_model_spec.rb
@@ -209,6 +209,19 @@ def self.===(_other)
       end
       # rubocop:enable Lint/LiteralAsCondition
     end
+
+    it "works for multiple mocks of the same model" do
+      foo = mock_model(MockableModel)
+      bar = mock_model(MockableModel)
+      baz = mock_model(MockableModelNoPrimaryKey)
+      quz = mock_model(MockableModel)
+
+      expect(MockableModel === foo).to be(true)
+      expect(MockableModel === bar).to be(true)
+      expect(MockableModel === baz).to be(false)
+      expect(MockableModelNoPrimaryKey === baz).to be(true)
+      expect(MockableModel === quz).to be(true)
+    end
   end
 
   describe "#kind_of?" do
diff --git a/spec/rspec/active_model/mocks/stub_model_spec.rb b/spec/rspec/active_model/mocks/stub_model_spec.rb
index 97c5819..a5f5adf 100644
--- a/spec/rspec/active_model/mocks/stub_model_spec.rb
+++ b/spec/rspec/active_model/mocks/stub_model_spec.rb
@@ -181,5 +181,18 @@ def model_class
       end
       # rubocop:enable Lint/LiteralAsCondition
     end
+
+    it "works for multiple mocks of the same model" do
+      foo = stub_model(MockableModel)
+      bar = stub_model(MockableModel)
+      baz = stub_model(MockableModelNoPrimaryKey)
+      qux = stub_model(MockableModel)
+
+      expect(MockableModel === foo).to be(true)
+      expect(MockableModel === bar).to be(true)
+      expect(MockableModel === baz).to be(false)
+      expect(MockableModelNoPrimaryKey === baz).to be(true)
+      expect(MockableModel === qux).to be(true)
+    end
   end
 end