diff --git a/lib/octocatalog-diff/catalog.rb b/lib/octocatalog-diff/catalog.rb
index 356b5949..ce5c5cc8 100644
--- a/lib/octocatalog-diff/catalog.rb
+++ b/lib/octocatalog-diff/catalog.rb
@@ -304,17 +304,32 @@ def resources_missing_from_catalog(resources_to_check)
         unless res =~ /\A([\w:]+)\[(.+)\]\z/
           raise ArgumentError, "Resource #{res} is not in the expected format"
         end
-        resource(type: Regexp.last_match(1), title: Regexp.last_match(2)).nil?
+
+        type = Regexp.last_match(1)
+        title = normalized_title(Regexp.last_match(2), type)
+        resource(type: type, title: title).nil?
       end
     end
 
+    # Private method: Given a title string, normalize it according to the rules
+    # used by puppet 4.10.x for file resource title normalization:
+    # https://github.com/puppetlabs/puppet/blob/4.10.x/lib/puppet/type/file.rb#L42
+    def normalized_title(title_string, type)
+      return title_string if type != 'File'
+
+      matches = title_string.match(%r{^(?<normalized_path>/|.+:/|.*[^/])/*\Z}m)
+      matches[:normalized_path] || title_string
+    end
+
     # Private method: Build the resource hash to be used used for O(1) lookups by type and title.
     # This method is called the first time the resource hash is accessed.
     def build_resource_hash
       @resource_hash = {}
       resources.each do |resource|
         @resource_hash[resource['type']] ||= {}
-        @resource_hash[resource['type']][resource['title']] = resource
+
+        title = normalized_title(resource['title'], resource['type'])
+        @resource_hash[resource['type']][title] = resource
 
         if resource.key?('parameters') && resource['parameters'].key?('alias')
           @resource_hash[resource['type']][resource['parameters']['alias']] = resource
diff --git a/spec/octocatalog-diff/fixtures/repos/reference-validation/hieradata/roles/working-file.yaml b/spec/octocatalog-diff/fixtures/repos/reference-validation/hieradata/roles/working-file.yaml
new file mode 100644
index 00000000..deec3152
--- /dev/null
+++ b/spec/octocatalog-diff/fixtures/repos/reference-validation/hieradata/roles/working-file.yaml
@@ -0,0 +1,3 @@
+---
+  classes:
+    - test::file_tests
diff --git a/spec/octocatalog-diff/fixtures/repos/reference-validation/modules/test/manifests/file_tests.pp b/spec/octocatalog-diff/fixtures/repos/reference-validation/modules/test/manifests/file_tests.pp
new file mode 100644
index 00000000..9375be82
--- /dev/null
+++ b/spec/octocatalog-diff/fixtures/repos/reference-validation/modules/test/manifests/file_tests.pp
@@ -0,0 +1,10 @@
+class test::file_tests {
+  file { '/foo':
+    ensure => directory,
+  }
+
+  file { '/bar':
+    ensure  => directory,
+    require => File['/foo/'],
+  }
+}
diff --git a/spec/octocatalog-diff/integration/reference_validation_spec.rb b/spec/octocatalog-diff/integration/reference_validation_spec.rb
index b35bc668..f4ea3de5 100644
--- a/spec/octocatalog-diff/integration/reference_validation_spec.rb
+++ b/spec/octocatalog-diff/integration/reference_validation_spec.rb
@@ -93,6 +93,26 @@ def self.catalog_contains_resource(result, type, title)
     end
   end
 
+  context 'with valid files that have trailing slashes' do
+    before(:all) do
+      @result = OctocatalogDiff::Spec.reference_validation_catalog('working-file', %w(require))
+    end
+
+    it 'should succeed' do
+      expect(@result.exitcode).to eq(0)
+    end
+
+    it 'should not raise any exceptions' do
+      expect(@result.exception).to be_nil, OctocatalogDiff::Integration.format_exception(@result)
+    end
+
+    it 'should contain representative resources' do
+      pending 'Catalog failed' unless @result.exitcode.zero?
+      expect(OctocatalogDiff::Spec.catalog_contains_resource(@result, 'File', '/foo')).to eq(true)
+      expect(OctocatalogDiff::Spec.catalog_contains_resource(@result, 'File', '/bar')).to eq(true)
+    end
+  end
+
   context 'with broken subscribe' do
     before(:all) do
       @result = OctocatalogDiff::Spec.reference_validation_catalog('broken-subscribe', %w(subscribe))
diff --git a/spec/octocatalog-diff/tests/catalog_spec.rb b/spec/octocatalog-diff/tests/catalog_spec.rb
index 84db4dd8..34dc598b 100644
--- a/spec/octocatalog-diff/tests/catalog_spec.rb
+++ b/spec/octocatalog-diff/tests/catalog_spec.rb
@@ -621,6 +621,14 @@
             'alias' => 'the exec',
             'command' => '/bin/true'
           }
+        },
+        {
+          'type' => 'File',
+          'title' => '/foo/'
+        },
+        {
+          'type' => 'File',
+          'title' => '/bar'
         }
       ]
       described_object = described_class.allocate
@@ -636,5 +644,14 @@
     it 'should contain the entry for the aliased resource' do
       expect(@resource_hash['Exec']['the exec']).to be_a_kind_of(Hash)
     end
+
+    it 'should normalize trailing slashes on file resources' do
+      expect(@resource_hash['File']['/foo']).to be_a_kind_of(Hash)
+      expect(@resource_hash['File']['/foo/']).to eq(nil)
+    end
+
+    it 'should not otherwise touch file resources that do not need to be normalized' do
+      expect(@resource_hash['File']['/bar']).to be_a_kind_of(Hash)
+    end
   end
 end