diff --git a/manifests/resource/location.pp b/manifests/resource/location.pp
index f3f41ce63..fed1912b8 100644
--- a/manifests/resource/location.pp
+++ b/manifests/resource/location.pp
@@ -159,7 +159,7 @@
   String $server                                      = undef,
   Optional[String] $www_root                          = undef,
   Optional[String] $autoindex                         = undef,
-  Optional[Array] $index_files                        = [
+  Array $index_files                                  = [
     'index.html',
     'index.htm',
     'index.php'],
diff --git a/manifests/resource/server.pp b/manifests/resource/server.pp
index 6e4d44d7a..e0200fa3e 100644
--- a/manifests/resource/server.pp
+++ b/manifests/resource/server.pp
@@ -200,7 +200,7 @@
   Optional[String] $uwsgi                                                        = undef,
   Optional[String] $uwsgi_params                                                 = "${nginx::config::conf_dir}/uwsgi_params",
   Optional[String] $uwsgi_read_timeout                                           = undef,
-  Optional[Array] $index_files                                                   = [
+  Array $index_files                                                             = [
     'index.html',
     'index.htm',
     'index.php'],
diff --git a/spec/defines/resource_location_spec.rb b/spec/defines/resource_location_spec.rb
index ffd940112..22bab3c4b 100644
--- a/spec/defines/resource_location_spec.rb
+++ b/spec/defines/resource_location_spec.rb
@@ -339,6 +339,12 @@
               attr: 'index_files',
               value: %w[name1 name2],
               match: '    index     name1 name2;'
+            },
+            {
+              title: 'should not set index_file(s)',
+              attr: 'index_files',
+              value: [],
+              notmatch: %r{\s+index\s+}
             }
           ].each do |param|
             context "when #{param[:attr]} is #{param[:value]}" do
@@ -391,6 +397,12 @@
               attr: 'index_files',
               value: %w[name1 name2],
               match: '    index     name1 name2;'
+            },
+            {
+              title: 'should not set index_file(s)',
+              attr: 'index_files',
+              value: [],
+              notmatch: %r{\s+index\s+}
             }
           ].each do |param|
             context "when #{param[:attr]} is #{param[:value]}" do
diff --git a/spec/defines/resource_server_spec.rb b/spec/defines/resource_server_spec.rb
index 82bbac8bc..7431ef361 100644
--- a/spec/defines/resource_server_spec.rb
+++ b/spec/defines/resource_server_spec.rb
@@ -329,8 +329,8 @@
             {
               title: 'should not set index_file(s)',
               attr: 'index_files',
-              value: :undef,
-              match: %r{^((?!index).)*$}
+              value: [],
+              notmatch: %r{\s+index\s+}
             }
           ].each do |param|
             context "when #{param[:attr]} is #{param[:value]}" do
@@ -757,8 +757,8 @@
             {
               title: 'should not set index_file(s)',
               attr: 'index_files',
-              value: :undef,
-              match: %r{^((?!index).)*$}
+              value: [],
+              notmatch: %r{\s+index\s+}
             }
           ].each do |param|
             context "when #{param[:attr]} is #{param[:value]}" do