diff --git a/manifests/server/dbgroup.pp b/manifests/server/dbgroup.pp
index b043ca8072..5db2696915 100644
--- a/manifests/server/dbgroup.pp
+++ b/manifests/server/dbgroup.pp
@@ -23,6 +23,14 @@
     $port_override = $postgresql::server::port
   }
 
+  #
+  # Group members, converted to a string acceptable by psql
+  # [user1, user2] to {"user1", "user2"}
+  #
+  $groupmembers_braces = regsubst("${groupmembers}", '^\[(.*)\]$', '{"\1"}')
+  $groupmembers_strip_empty_array = regsubst("${groupmembers_braces}", '^{""}$', '{}')
+  $groupmembers_psql = regsubst("${groupmembers_strip_empty_array}", ', ', '", "', 'G')
+
   Postgresql_psql {
     db         => $db,
     port       => $port_override,
@@ -44,8 +52,8 @@
     require     => Class['Postgresql::Server'],
   }
 
-  postgresql_psql {"${title}: UPDATE pg_group SET grolist = ARRAY${groupmembers} WHERE groname = '${groupname}'":
-    command => "UPDATE pg_group SET grolist = ARRAY${groupmembers} WHERE groname = '${groupname}'",
-    unless => "SELECT 1 FROM pg_group WHERE groname = '${groupname}' AND grolist = ARRAY${groupmembers}",
+  postgresql_psql {"${title}: UPDATE pg_group SET grolist = '${groupmembers_psql}' WHERE groname = '${groupname}'":
+    command => "UPDATE pg_group SET grolist = '${groupmembers_psql}' WHERE groname = '${groupname}'",
+    unless => "SELECT 1 FROM pg_group WHERE groname = '${groupname}' AND grolist = '${groupmembers_psql}'",
   }
 }
\ No newline at end of file
diff --git a/spec/unit/defines/server/dbgroup_spec.rb b/spec/unit/defines/server/dbgroup_spec.rb
index 8d30921225..2ae879628c 100644
--- a/spec/unit/defines/server/dbgroup_spec.rb
+++ b/spec/unit/defines/server/dbgroup_spec.rb
@@ -33,11 +33,10 @@
         'port'        => "5432",
       })
     end
-    it 'should have update pg_group for test group with groupmembers as []' do
-      is_expected.to contain_postgresql_psql("test: UPDATE pg_group SET grolist = ARRAY[] WHERE groname = 'test'").with({
-        'command'     => "UPDATE pg_group SET grolist = ARRAY[] WHERE groname = 'test'",
-        'environment' => [],
-        'unless'      => "SELECT 1 FROM pg_group WHERE groname = 'test' AND grolist = ARRAY[]",
+    it 'should have update pg_group for test group with groupmembers as {}' do
+      is_expected.to contain_postgresql_psql("test: UPDATE pg_group SET grolist = '{}' WHERE groname = 'test'").with({
+        'command'     => "UPDATE pg_group SET grolist = '{}' WHERE groname = 'test'",
+        'unless'      => "SELECT 1 FROM pg_group WHERE groname = 'test' AND grolist = '{}'",
         'port'        => "5432",
       })
     end
@@ -65,10 +64,9 @@
       })
     end
     it 'should have update pg_group for test group with provided groupmembers' do
-      is_expected.to contain_postgresql_psql("test: UPDATE pg_group SET grolist = ARRAY[testuser1, testuser2] WHERE groname = 'test'").with({
-        'command'     => "UPDATE pg_group SET grolist = ARRAY[testuser1, testuser2] WHERE groname = 'test'",
-        'environment' => [],
-        'unless'      => "SELECT 1 FROM pg_group WHERE groname = 'test' AND grolist = ARRAY[testuser1, testuser2]",
+      is_expected.to contain_postgresql_psql("test: UPDATE pg_group SET grolist = '{\"testuser1\", \"testuser2\"}' WHERE groname = 'test'").with({
+        'command'     => "UPDATE pg_group SET grolist = '{\"testuser1\", \"testuser2\"}' WHERE groname = 'test'",
+        'unless'      => "SELECT 1 FROM pg_group WHERE groname = 'test' AND grolist = '{\"testuser1\", \"testuser2\"}'",
         'port'        => "5432",
       })
     end
diff --git a/spec/unit/defines/server/role_spec.rb b/spec/unit/defines/server/role_spec.rb
index 7df6a7264a..8b02660949 100644
--- a/spec/unit/defines/server/role_spec.rb
+++ b/spec/unit/defines/server/role_spec.rb
@@ -255,7 +255,6 @@
     it 'should have an alter statement to set PASSWORD DISABLE' do
       is_expected.to contain_postgresql_psql('test: ALTER USER "test" PASSWORD DISABLE').with({
         'command'     => "ALTER USER \"test\" PASSWORD DISABLE",
-        'environment' => [],
         'port'        => "5432",
       })
     end